6-{(E)-2-[4-(dimethylamino)phenyl]ethenyl}-8-isopropyl-1,1-dimethoxy-11-methylheptaleno[4,5-c]furan-3(1H)-one

dimethyl 1-(chloromethyl)-9-isopropyl-6-methylheptalene-4,5-dicarboxylate

5-(Diethoxy-phosphorylmethyl)-7-isopropyl-10-methyl-heptalene-1,2-dicarboxylic acid dimethyl ester

dimethyl 1-{(E)-2-[4-(dimethylamino)phenyl]ethenyl}-9-isoproplyl-6-methylheptalene-4,5-dicarboxylate