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The title compound, C 18 H 12 N 6 O 6 , was prepared from the reaction of 4-(phenyl­diazen­yl)aniline (aniline yellow) with picryl­sulfonic acid. The dihedral angle formed by the two benzene rings of the diphenyl­diazenyl ring system is 6.55 (13)° and that formed by the rings of the picrate–aniline ring system is 48.76 (12)°. The mol­ecule contains an intra­molecular aniline–nitro N—H⋯O hydrogen bond.

2,4,6-Trinitro-N-[4-(phenyldiazenyl)phenyl]aniline