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