t-butyl 5-(3,3-dimethyl-2-nitro-5-oxohexyl)-3-(2-methoxycarbonylethyl)-4-methylpyrrole-2-carboxylate

(rac)-tert-Butyl-3-(2-methoxycarbonylethyl)-4-methyl-5-(2-nitro-3,3-dimethyl-4-methoxycarbonylbutyl)-pyrrole-2-carboxylate