4-Oxo-4-(1,3,4-thiadiazol-2-ylamino)butanoic acid ((4-hydroxyphenyl)methylene)hydrazide 89455-72-1 BRN 4206119 Butanoic acid, 4-oxo-4-(1,3,4-thiadiazol-2-ylamino)-, ((4-hydroxyphenyl)methylene)hydrazide