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