Robuta

https://webbook.nist.gov/cgi/cbook.cgi?ID=C95138662 P-phenylazo carbanilic acid, n-nonyl ester pacidnester https://webbook.nist.gov/cgi/cbook.cgi?ID=C95293428 P-phenylazo carbanilic acid, n-decyl ester pacidnester https://webbook.nist.gov/cgi/inchi/InChI%3D1S/C11H14N2O4/c1-2-3-8-17-11(14)12-9-4-6-10(7-5-9)13(15)16/h4-7H%2C2-3%2C8H2%2C1H3%2C(H%2C12%2C14) P-nitro carbanilic acid, n-butyl ester pnitroacidbutylester