4-(3-(4-butoxyphenyl)-5,6-dihydro[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-6-yl)-2-methoxyphenol (en)phenol, 4-[3-(4-butoxyphenyl)-5,6-dihydro-1,2,4-triazolo[3,4-b][1,3,4]thiadiazol-6-yl]-2-methoxy- (en)