3-Methyl-5-hydroxy-2'-nitro-1,1'-biphenyl-2,6-dicarboxylic acid 2-tert-butyl 6-methyl ester C??? ??, ??, ??

3-Methyl-5-hydroxy-2'-nitro-1,1'-biphenyl-2,6-dicarboxylic acid 2-tert-butyl 6-methyl ester ?? ?? ? ???

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3-Methyl-5-hydroxy-2'-nitro-1,1'-biphenyl-2,6-dicarboxylic acid 2-tert-butyl 6-methyl ester ?? ??