Answer
The IUPAC name of the compound is $2,4,6-trinitrobenzoic \hspace1mm acid$.
Work Step by Step
The acid has the carboxylic functional group attached to the benzene ring. It has 3 $nitro$ substituents at position 2,4,6. So, the IUPAC name of the compound is $2,4,6-trinitrobenzoic \hspace1mm acid$.