76549-60-5 Anthranilic acid, N-((1,3-dihydroxy-1-(p-nitrophenyl)-2-propyl)oxamoyl)-, DL-threo-, (+-)- DL-threo-(+)-N-((1,3-Dihydroxy-1-(p-nitrophenyl)-2-propyl)oxamoyl)anthranilic acid