8-isopropyl-1,1-dimethoxy-11-methyl-6-[(1E,3E)-4-(4-nitrophenyl)buta-1,3-dien-1-yl]heptaleno[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 9-isopropyl-6-methyl-1-[(1E,3E)-4-(4-nitrophenyl)buta-1,3-dien-1-yl]heptalene-4,5-dicarboxylate