3,4-dihydro-7-isopropoxy-1-(3-isopropoxy-4-methoxyphenyl)-3-[2-(3-isopropoxy-4-methoxyphenyl)ethyl]-8-methoxy-4-oxo-[1]benzopyrano[3,4-b]pyrrole-2-carboxylic acid

dimethyl 3-(4-isopropoxy-3-methoxyphenyl)-1-[2-(3-isopropoxy-4-methoxyphenyl)ethyl]-4-(trifluoromethanesulfonyloxy)pyrrole-2,5-dicarboxylate

dimethyl 3-(3-isopropoxy-4-methoxyphenyl)-1-[2-(3-isopropoxy-4-methoxyphenyl)ethyl]-4-(trifluoromethanesulfonyloxy)pyrrole-2,5-dicarboxylate

3,4-dihydro-7-isopropoxy-1-(4-isopropoxy-3-methoxyphenyl)-3-[2-(3-isopropoxy-4-methoxyphenyl)ethyl]-8-methoxy-4-oxo-[1]benzopyrano[3,4-b]pyrrole-2-carboxylic acid