2-(Methylsulfonyl)-4-nitroaniline (also known as 1-Amino-2-methylsulphonyl-4-nitrobenzene) is typically used as dye intermediate, e.g. Azo dye (pigment).
Hydrogen bonding in C-substituted nitroanilines: a chain of R3 3(12)rings in 2-methanesulfonyl-4-nitroaniline. [1]