2,4,6-Trinitrobenzoic acid (TNBA) is an organic compound with the formula (O2N)3C6H2CO2H.

It is a high explosive nitrated derivative of benzoic acid.

It is formed by oxidation of TNT and nitric acid with chlorate[2] and with dichromate.

[3] Upon heating, 2,4,6-trinitrobenzoic acid undergoes decarboxylation to give 1,3,5-trinitrobenzene.

[4] Reduction with tin gives 2,4,6-triaminobenzenoic acid, a precursor to phloroglucinol (1,3,5-trihydroxybenzene).