Product Index

1-(Diaminomethylidene)guanidine

Catalog No.: AA00DI0N

CAS No.:56-03-1 MDL No.: MFCD00045592

MF: C2H7N5 MW: 101.1105

Pricing and Availability

TE 393

Catalog No.: AA00DZT6

CAS No.:56-22-4 MDL No.: MFCD00943802

MF: C15H36N4 MW: 272.4731

Pricing and Availability

HEXOBARBITAL

Catalog No.: AA00D8RC

CAS No.:56-29-1 MDL No.: MFCD00057562

MF: C12H16N2O3 MW: 236.2670

Pricing and Availability

2,3,3-TRIMETHYLPENTANE

Catalog No.: AA00DE28

CAS No.:560-21-4 MDL No.: MFCD00048622

MF: C8H18 MW: 114.2285

Pricing and Availability

2,2-Dihydroxymalonic acid

Catalog No.: AA00DEN3

CAS No.:560-27-0 MDL No.: MFCD00085305

MF: C3H4O6 MW: 136.0603

Pricing and Availability

(8S,9R,10S,13S,14S)-9-Hydroxy-10,13-dimethyl-7,8,9,10,11,12,13,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-3,17(2H,6H)-dione

Catalog No.: AA00DJCY

CAS No.:560-62-3 MDL No.: MFCD00232925

MF: C19H26O3 MW: 302.4079

Pricing and Availability

N-(6-tert-Butyl-3-cyano-4,5,6,7-tetrahydro-1-benzothien-2-yl)-2-cyanoacetamide

Catalog No.: AA00JDDS

CAS No.:560072-41-5 MDL No.: MFCD03385360

MF: C16H19N3OS MW: 301.4066

Pricing and Availability

1H-Pyrazole,1-(2-furanylcarbonyl)-(9CI)

Catalog No.: AA00DIYF

CAS No.:560076-63-3 MDL No.: MFCD03385653

MF: C8H6N2O2 MW: 162.1454

Pricing and Availability

Methyl 2-[(cyanoacetyl)amino]-5,6,7,8-tetrahydro-4h-cyclohepta[b]thiophene-3-carboxylate

Catalog No.: AA00JDDY

CAS No.:560080-29-7 MDL No.: MFCD03385860

MF: C14H16N2O3S MW: 292.3534

Pricing and Availability

2-(2-Chloro-acetylamino)-4,5,6,7-tetrahydro-benzo[b]thiophene-3-carboxylic acid isopropyl ester

Catalog No.: AA00JBQM

CAS No.:560080-98-0 MDL No.: MFCD03385896

MF: C14H18ClNO3S MW: 315.8156

Pricing and Availability

4-METHYLPYRAZOLE HYDROCHLORIDE

Catalog No.: AA00DEM6

CAS No.:56010-88-9 MDL No.: MFCD00012707

MF: C4H7ClN2 MW: 118.5648

Pricing and Availability

2-Chloro-N-((tetrahydrofuran-2-yl)methyl)nicotinamide

Catalog No.: AA01DOAG

CAS No.:560102-88-7 MDL No.: MFCD03384779

MF: C11H13ClN2O2 MW: 240.6861

Pricing and Availability

(2-Chloropyridin-3-yl)(3-methylpiperidin-1-yl)methanone

Catalog No.: AA00DKL8

CAS No.:560106-13-0 MDL No.: MFCD03385184

MF: C12H15ClN2O MW: 238.7133

Pricing and Availability

Isopentyl phenethylether

Catalog No.: AA01EA9W

CAS No.:56011-02-0 MDL No.: MFCD00169817

MF: C13H20O MW: 192.2973

Pricing and Availability

2,2-Diethoxypropanenitrile

Catalog No.: AA003B0H

CAS No.:56011-12-2 MDL No.: MFCD00209573

MF: C7H13NO2 MW: 143.1836

Pricing and Availability

Methyl 3-bromo-5-tert-butylbenzoate

Catalog No.: AA00DA5Y

CAS No.:560131-64-8 MDL No.: MFCD03840763

MF: C12H15BrO2 MW: 271.1503

Pricing and Availability

Urea, N,N-diethyl-N''''-(4-Methoxyphenyl)-

Catalog No.: AA00DK8G

CAS No.:56015-84-0 MDL No.: MFCD00026724

MF: C12H18N2O2 MW: 222.2835

Pricing and Availability

4-METHYLACETANILIDE

Catalog No.: AA00DBXH

CAS No.:5602-96-0 MDL No.: MFCD00025853

MF: C9H11NO2 MW: 165.1891

Pricing and Availability

Methyl 2-Methyl-1-naphthoate

Catalog No.: AA00DBFM

CAS No.:56020-58-7 MDL No.: MFCD06203919

MF: C13H12O2 MW: 200.2332

Pricing and Availability

2,4-Dichloro-6-methylnicotinic acid

Catalog No.: AA00D8SZ

CAS No.:56022-07-2 MDL No.: MFCD03086007

MF: C7H5Cl2NO2 MW: 206.0261

Pricing and Availability

ETHYLTRI-N-OCTYLPHOSPHONIUM BROMIDE

Catalog No.: AA00DH57

CAS No.:56022-37-8 MDL No.: MFCD00040577

MF: C26H56BrP MW: 479.6006

Pricing and Availability

2-Thioxo-2,3-dihydro-4h-1,3-benzothiazin-4-one

Catalog No.: AA018WOS

CAS No.:56022-26-5 MDL No.: MFCD00491949

MF: C8H5NOS2 MW: 195.2614

Pricing and Availability

1H-Purine-2,6-dione, 3,7-dihydro-3-Methyl-7-(phenylMethyl)-

Catalog No.: AA00DJN8

CAS No.:56025-86-6 MDL No.: MFCD00981459

MF: C13H12N4O2 MW: 256.2600

Pricing and Availability

8-Hydroxyquinoline-2-carbaldehyde oxime

Catalog No.: AA00DYHK

CAS No.:5603-22-5 MDL No.: MFCD00168964

MF: C10H8N2O2 MW: 188.1827

Pricing and Availability

(E)-3-(3-Methoxyphenyl)-2-propenoyl chloride

Catalog No.: AA00DHYS

CAS No.:56030-38-7 MDL No.: MFCD11939177

MF: C10H9ClO2 MW: 196.6303

Pricing and Availability

(R)-2-HYDROXY-2-METHYL(4-METHYLBENZENE)ACETIC ACID

Catalog No.: AA00DAYE

CAS No.:56031-84-6 MDL No.: MFCD05663593

MF: C10H12O3 MW: 180.2005

Pricing and Availability

2,2',3,4,4',6-HEXACHLOROBIPHENYL

Catalog No.: AA00DDVM

CAS No.:56030-56-9 MDL No.: MFCD00152539

MF: C12H4Cl6 MW: 360.8782

Pricing and Availability

Ethyl 4,6-dichloropyrimidine-2-carboxylate

Catalog No.: AA00DJJQ

CAS No.:56032-01-0 MDL No.: MFCD13195087

MF: C7H6Cl2N2O2 MW: 221.0407

Pricing and Availability

4-Chloro-6-methoxy-2-(methylthio)pyrimidine-5-carbonitrile

Catalog No.: AA01FMKC

CAS No.:56035-75-7 MDL No.: MFCD29762284

MF: C7H6ClN3OS MW: 215.6600

Pricing and Availability

9-BENZYL-2-CHLORO-9H-PURIN-6-YLAMINE

Catalog No.: AA00DHYE

CAS No.:56046-25-4 MDL No.: MFCD01026101

MF: C12H10ClN5 MW: 259.6943

Pricing and Availability

2-(2-BENZOTHIAZOLYL)-6-METHYLPHENOL

Catalog No.: AA00DBZS

CAS No.:56048-53-4 MDL No.: MFCD00043775

MF: C14H11NOS MW: 241.3082

Pricing and Availability

2-(Benzo[d]thiazol-2-yl)-5-methylphenol

Catalog No.: AA00DBZW

CAS No.:56048-54-5 MDL No.: MFCD00043783

MF: C14H11NOS MW: 241.3082

Pricing and Availability

(3R,5S)-5-(Hydroxymethyl)-1-tosylpyrrolidin-3-ol

Catalog No.: AA00I9XD

CAS No.:5605-46-9 MDL No.: MFCD09864503

MF: C12H17NO4S MW: 271.3327

Pricing and Availability

3-(2-hydroxyphenyl)-1-phenylpropan-1-one

Catalog No.: AA00DYNJ

CAS No.:56052-53-0 MDL No.: MFCD11110625

MF: C15H14O2 MW: 226.2705

Pricing and Availability

5,10,15,20-Tetrakis(4-sulfonatophenyl)-21h,23h-porphine copper(ii)

Catalog No.: AA00I9XC

CAS No.:56047-84-8 MDL No.: MFCD03425949

MF: C44H28CuN4O12S4 MW: 996.5187

Pricing and Availability

1-(4-BENZYL-PIPERAZIN-1-YL)-2-CHLORO-ETHANONE

Catalog No.: AA00D8S0

CAS No.:56056-37-2 MDL No.: MFCD01964635

MF: C13H17ClN2O MW: 252.7399

Pricing and Availability

5-methyl-1,3-dihydropyrrolo[3,2-b]pyridin-2-one

Catalog No.: AA01FYKW

CAS No.:56057-24-0 MDL No.:

MF: C8H8N2O MW: 148.1619

Pricing and Availability

2-(2-Butoxyethyl)-1h-isoindole-1,3(2h)-dione

Catalog No.: AA00J9AQ

CAS No.:56058-19-6 MDL No.: MFCD12198096

MF: C14H17NO3 MW: 247.2897

Pricing and Availability

3-Azabicyclo[3.1.0]hexane-1-carbonitrile, 3-(phenylmethyl)-

Catalog No.: AA00DB0U

CAS No.:56062-59-0 MDL No.: MFCD11042334

MF: C13H14N2 MW: 198.2637

Pricing and Availability

Benzaldehyde, 4-amino-3,5-dimethyl- (9CI)

Catalog No.: AA00DBBI

CAS No.:56066-83-2 MDL No.: MFCD16251133

MF: C9H11NO MW: 149.1897

Pricing and Availability

(2R,3S,5R)-2-(((tert-butyldimethylsilyl)oxy)methyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl acetate

Catalog No.: AA01DG45

CAS No.:56070-42-9 MDL No.: MFCD31803673

MF: C18H30N2O6Si MW: 398.5261

Pricing and Availability

1-(1-Hydroxy-1-methylethyl)cyclopentanol

Catalog No.: AA00JGHF

CAS No.:5607-45-4 MDL No.: MFCD01532266

MF: C8H16O2 MW: 144.2114

Pricing and Availability

6-(3,4-DIHYDROXYSTYRL)-4-HYDROXY-2-PYRONE

Catalog No.: AA00DANY

CAS No.:56070-89-4 MDL No.:

MF: C16H16O5 MW: 288.2952

Pricing and Availability

4(3H)-Quinazolinone, 2-(3-Methoxyphenyl)-

Catalog No.: AA00DB15

CAS No.:56071-04-6 MDL No.: MFCD02943229

MF: C15H12N2O2 MW: 252.2680

Pricing and Availability

N-(2-Chloro-4-hydroxy-phenyl)-acetamide

Catalog No.: AA00DLTS

CAS No.:56074-07-8 MDL No.: MFCD20212043

MF: C8H8ClNO2 MW: 185.6076

Pricing and Availability

tert-Butyl2,6-dioxomorpholine-4-carboxylate

Catalog No.: AA019DI3

CAS No.:56074-21-6 MDL No.: MFCD24465561

MF: C9H13NO5 MW: 215.2032

Pricing and Availability

Methyl 2-(4-(chlorosulfonyl)phenoxy)acetate

Catalog No.: AA00DHTS

CAS No.:56077-78-2 MDL No.: MFCD08274832

MF: C9H9ClO5S MW: 264.6828

Pricing and Availability

4-Chloro-1,3,5-trimethyl-1h-pyrazole

Catalog No.: AA00I9XI

CAS No.:56079-15-3 MDL No.: MFCD00464340

MF: C6H9ClN2 MW: 144.6021

Pricing and Availability

Isobavachromene

Catalog No.: AA00DHKC

CAS No.:56083-03-5 MDL No.: MFCD21333543

MF: C20H18O4 MW: 322.3545

Pricing and Availability

2-Hydroxymethyl-1-phenyl-cyclohexanol

Catalog No.: AA00DYPM

CAS No.:56086-94-3 MDL No.: MFCD10574801

MF: C13H18O2 MW: 206.2808

Pricing and Availability

5-(oxiran-2-ylmethyl)-10,11-dihydro-5H-dibenzo[b,f]azepine

Catalog No.: AA01EWDR

CAS No.:56080-18-3 MDL No.: MFCD06150022

MF: C17H17NO MW: 251.3230

Pricing and Availability

Piperidin-2-ylmethanol HCl

Catalog No.: AA01DKLX

CAS No.:56098-47-6 MDL No.: MFCD08073388

MF: C6H14ClNO MW: 151.6345

Pricing and Availability

2-(Chloromethyl)piperidine

Catalog No.: AA00DJKM

CAS No.:56098-50-1 MDL No.: MFCD02667639

MF: C6H12ClN MW: 133.6192

Pricing and Availability

4-Methyl-2,2'-bipyridine

Catalog No.: AA00DFWW

CAS No.:56100-19-7 MDL No.: MFCD08062570

MF: C11H10N2 MW: 170.2105

Pricing and Availability

[2,2'-Bipyridine]-5-carboxylic acid, ethyl ester

Catalog No.: AA00DK5T

CAS No.:56100-24-4 MDL No.:

MF: C13H12N2O2 MW: 228.2466

Pricing and Availability

[2,2'-Bipyridine]-4-carboxylic acid, ethyl ester

Catalog No.: AA00DK5S

CAS No.:56100-25-5 MDL No.:

MF: C13H12N2O2 MW: 228.2466

Pricing and Availability

Proto-pa

Catalog No.: AA00DL3W

CAS No.:561007-63-4 MDL No.:

MF: C50H82O22 MW: 1035.1729

Pricing and Availability

2-isopropoxybenzaldehyde oxime

Catalog No.: AA00J7V1

CAS No.:561009-00-5 MDL No.: MFCD02257390

MF: C10H13NO2 MW: 179.2157

Pricing and Availability

tert-Butyl 2-[(2-bromobenzoyl)amino]ethylcarbamate

Catalog No.: AA01JKAZ

CAS No.:561030-83-9 MDL No.: MFCD18804162

MF: C14H19BrN2O3 MW: 343.2163

Pricing and Availability

PYR-GLN-PHE-PHE-GLY-LEU-MET-NH2

Catalog No.: AA00D85F

CAS No.:56104-22-4 MDL No.: MFCD00080128

MF: C41H57N9O9S MW: 852.0112

Pricing and Availability

1,3-Di-n-propoxybenzene

Catalog No.: AA003DHX

CAS No.:56106-37-7 MDL No.: MFCD00059402

MF: C12H18O2 MW: 194.2701

Pricing and Availability

3-AMino-4-phenoxy-5-sulfaMoyl-benzoic Acid Methyl Ester

Catalog No.: AA00DEWN

CAS No.:56106-57-1 MDL No.: MFCD09952453

MF: C14H14N2O5S MW: 322.3364

Pricing and Availability

2-[4-(9,10-Di-2-naphthalenyl-2-anthracenyl)phenyl]-1-phenyl-

Catalog No.: AA00DBJ1

CAS No.:561064-11-7 MDL No.: MFCD22380691

MF: C53H34N2 MW: 698.8505

Pricing and Availability

3-(p-tert-butylphenyl)-2-methylpropanol

Catalog No.: AA00E6UG

CAS No.:56107-04-1 MDL No.: MFCD00458910

MF: C14H22O MW: 206.3239

Pricing and Availability

1-Benzyl-4-(p-chlorophenyl)-4-piperidinol

Catalog No.: AA00D800

CAS No.:56108-25-9 MDL No.: MFCD08308871

MF: C18H20ClNO MW: 301.8105

Pricing and Availability

1-BENZYL-4-HYDROXY-4-(3-TRIFLUOROTOLYL)PIPERIDINOL

Catalog No.: AA00DJI6

CAS No.:56108-27-1 MDL No.: MFCD04091722

MF: C19H20F3NO MW: 335.3634

Pricing and Availability

Di-Tert-Butylchlorophosphate

Catalog No.: AA00376J

CAS No.:56119-60-9 MDL No.: MFCD01320996

MF: C8H18ClO3P MW: 228.6535

Pricing and Availability

EMERALDINE BASE POLYANILINE

Catalog No.: AA00D7YQ

CAS No.:5612-44-2 MDL No.:

MF: C48H38N8 MW: 726.8689

Pricing and Availability

1-(DIMETHYLAMINO)-2-PHENYL-2-BUTANOL

Catalog No.: AA00DD8D

CAS No.:5612-61-3 MDL No.: MFCD12974676

MF: C12H19NO MW: 193.2854

Pricing and Availability

Benzamide, N-(2,4-diaminophenyl)-

Catalog No.: AA01IH6B

CAS No.:56120-01-5 MDL No.:

MF: C13H13N3O MW: 227.2618

Pricing and Availability

Asperglaucide

Catalog No.: AA00DGP2

CAS No.:56121-42-7 MDL No.: MFCD17214814

MF: C27H28N2O4 MW: 444.5222

Pricing and Availability

4-O-Methylhelichrysetin

Catalog No.: AA00DJX4

CAS No.:56121-44-9 MDL No.: MFCD25973644

MF: C17H16O5 MW: 300.3059

Pricing and Availability

4-Chloro-2-methylpyrido[3,2-d]pyrimidine

Catalog No.: AA00DI1H

CAS No.:56128-29-1 MDL No.: MFCD11046862

MF: C8H6ClN3 MW: 179.6063

Pricing and Availability

Methyl 2,3,4-trihydroxybenzoate

Catalog No.: AA00E6V3

CAS No.:56128-66-6 MDL No.: MFCD02149451

MF: C8H8O5 MW: 184.1461

Pricing and Availability

(2E)-1-(2,5-dichlorophenyl)-3-(4-ethylphenyl)prop-2-en-1-one

Catalog No.: AA00JU06

CAS No.:561280-18-0 MDL No.: MFCD04687484

MF: C17H14Cl2O MW: 305.1985

Pricing and Availability

Quinoline, 1,2,3,4-tetrahydro-4,4-diMethyl-7-nitro-

Catalog No.: AA00DKQJ

CAS No.:561297-83-4 MDL No.: MFCD07636589

MF: C11H14N2O2 MW: 206.2411

Pricing and Availability

7'-AMinospiro[cyclopropane-1,4'(1'H)-isoquinoline]-2'(3'H)carboxylic Acid 1,1-DiMethyl Ester

Catalog No.: AA00DDAU

CAS No.:561297-88-9 MDL No.: MFCD16619041

MF: C16H22N2O2 MW: 274.3581

Pricing and Availability

ethyl 2-(2-aminoethyl)-4,5,6,7-tetrahydro-2H-indazole-3-carboxylate

Catalog No.: AA00DG2D

CAS No.:561299-63-6 MDL No.: MFCD22572543

MF: C12H19N3O2 MW: 237.2982

Pricing and Availability

3,4,7,8,9,10-Hexahydropyrazino[1,2-b]indazol-1(2H)-one

Catalog No.: AA00DG2K

CAS No.:561299-72-7 MDL No.: MFCD11977690

MF: C10H13N3O MW: 191.2297

Pricing and Availability

Methyl 5-bromo-2,3-dimethylbenzoate

Catalog No.: AA01EBRD

CAS No.:5613-28-5 MDL No.: MFCD24107098

MF: C10H11BrO2 MW: 243.0971

Pricing and Availability

tert-Butyl (2-(trifluoromethoxy)phenyl)carbamate

Catalog No.: AA00DA5H

CAS No.:561304-39-0 MDL No.: MFCD07367873

MF: C12H14F3NO3 MW: 277.2397

Pricing and Availability

1,1,1-Trimethyl-N-(3-(trifluoromethoxy)phenyl)silanamine

Catalog No.: AA01EWDU

CAS No.:561304-47-0 MDL No.: MFCD14666453

MF: C10H14F3NOSi MW: 249.3050

Pricing and Availability

2-Amino-6-(trifluoromethoxy)benzoic acid

Catalog No.: AA00D8T0

CAS No.:561304-48-1 MDL No.: MFCD08669643

MF: C8H6F3NO3 MW: 221.1333

Pricing and Availability

tert-Butyl 5-(chloromethyl)-1h-indole-1-carboxylate

Catalog No.: AA00IKVC

CAS No.:561307-62-8 MDL No.: MFCD13183425

MF: C14H16ClNO2 MW: 265.7353

Pricing and Availability

tert-Butyl 5-(3-methoxy-3-oxoprop-1-en-1-yl)-1H-indole-1-carboxylate

Catalog No.: AA00E8DH

CAS No.:561307-71-9 MDL No.: MFCD13183417

MF: C17H19NO4 MW: 301.3371

Pricing and Availability

4-Cyanophenyl 4-ethylbenzoate

Catalog No.: AA00I9Y6

CAS No.:56131-48-7 MDL No.: MFCD00429470

MF: C16H13NO2 MW: 251.2799

Pricing and Availability

4-Cyanophenyl 4-propylbenzoate

Catalog No.: AA003L6P

CAS No.:56131-49-8 MDL No.: MFCD03410282

MF: C17H15NO2 MW: 265.3065

Pricing and Availability

(2S)-2-AMino-3,3,3-trifluoro-1-propanol

Catalog No.: AA00DD9W

CAS No.:561323-79-3 MDL No.: MFCD19213099

MF: C3H6F3NO MW: 129.0810

Pricing and Availability

N-1-Adamantyladamantan-1-amine hydrochloride

Catalog No.: AA01EA84

CAS No.:561327-49-9 MDL No.: MFCD02683779

MF: C20H32ClN MW: 321.9278

Pricing and Availability

PGLU-HIS-TRP-SER-TYR-D-ALA-N-METHYL-LEU-ARG-PRO-GLY-NH2

Catalog No.: AA00DAUE

CAS No.:56133-95-0 MDL No.: MFCD00133501

MF: C57H79N17O13 MW: 1210.3433

Pricing and Availability

α-Methoxy-α-(trifluoromethyl)phenylacetic acid

Catalog No.: AA003VD6

CAS No.:56135-03-6 MDL No.: MFCD00066637

MF: C10H9F3O3 MW: 234.1719

Pricing and Availability

AdaMantane-1,3-diol Monoacetate

Catalog No.: AA00DLEC

CAS No.:56137-59-8 MDL No.: MFCD29045518

MF: C12H18O3 MW: 210.2695

Pricing and Availability

2,6-Dibenzhydryl-4-methylaniline

Catalog No.: AA01EFE2

CAS No.:56138-96-6 MDL No.: MFCD23704470

MF: C33H29N MW: 439.5901

Pricing and Availability

2,5-Dimethyl-1H-pyrrole-3,4-dicarbaldehyde

Catalog No.: AA00DGDZ

CAS No.:56139-74-3 MDL No.: MFCD02660558

MF: C8H9NO2 MW: 151.1626

Pricing and Availability

(4-Methyl-couMarin-7-yloxy)-acetic acid ethyl ester

Catalog No.: AA00DK4K

CAS No.:5614-82-4 MDL No.: MFCD00514071

MF: C14H14O5 MW: 262.2580

Pricing and Availability

(24R)-1(ALPHA),24,25-TRIHYDROXYVITAMIN D3*

Catalog No.: AA00DF14

CAS No.:56142-94-0 MDL No.: MFCD02683432

MF: C27H44O4 MW: 432.6359

Pricing and Availability

(8R,11S)-pentacyclo[5.4.0.0^{2,6}.0^{3,10}.0^{5,9}]undecane-8,11-diol

Catalog No.: AA00N2JB

CAS No.:56143-86-3 MDL No.: MFCD00209423

MF: C11H14O2 MW: 178.2277

Pricing and Availability

N1-(4,6-Dichloro-5-nitro-2-pyriMidinyl)acetaMide

Catalog No.: AA00DIMC

CAS No.:56145-04-1 MDL No.: MFCD09837031

MF: C6H4Cl2N4O3 MW: 251.0270

Pricing and Availability

2-Chloro-N-(p-tolyl)nicotinamide

Catalog No.: AA01GH9N

CAS No.:56149-24-7 MDL No.:

MF: C13H11ClN2O MW: 246.6922

Pricing and Availability

2-Chloro-N-phenylnicotinamide

Catalog No.: AA00DQCU

CAS No.:56149-29-2 MDL No.: MFCD00663736

MF: C12H9ClN2O MW: 232.6657

Pricing and Availability