InChI=1/C13H11N3O4/c17-12-7-3-10(4-8-12)15-13(18)14-9-1-5-11(6-2-9)16(19)20/h1-8,17H,(H2,14,15,18 N-(4-hydroxyphenyl)-N'-(4-nitrophenyl)urea urea, N-(4-hydroxyphenyl)-N'-(4-nitrophenyl)-