InChI=1/C14H12N2O6/c1-22-14(19)13-11(3-2-4-12(13)16(20)21)15-8-5-9(17)7-10(18)6-8/h2-7,15,17-18H,1H benzoic acid, 2-[(3,5-dihydroxyphenyl)amino]-6-nitro-, methyl ester methyl 2-[(3,5-dihydroxyphenyl)amino]-6-nitrobenzoate