3-(Carboxymethyl)-1-methylpyridiniumiodid 
 
3719-45-7 
 
98279-50-6 
 
1,6-Dihydro-1-methyl-6-oxo-3-pyridinessigsaeure 
 
1,2-Dihydro-1-methyl-2-oxo-3-pyridinessigsaeure 
[1]ChemischeBerichte,1985,vol.118,p.4086-4098