[1]JournalofHeterocyclicChemistry,1987,vol.24,p.181-185
[1]JournalofMedicinalChemistry,1986,vol.29,p.2364-2369
[1]BioorganicandMedicinalChemistryLetters,2006,vol.16,p.5270-5274
[1]CurrentPatentAssignee:TAKEDAPHARMACEUTICALCOMPANYLIMITED-EP1553074,2005,A1Locationinpatent:Page/Pagecolumn69
[1]Patent:US4649144,1987,A