2β,4β-dicarboxy-3,3-(ethylenedioxy)-7α-carboxy-7β-methyl-(1α,5α)-bicyclo<3.3.0>octane

methyl [2S-(2α,3aα,3bβ,7aα)]-2,3,3a,3b,4,5,7,7a-octahydro-2,3b-dimethyl-4-[(dimethylamino)methyl]-5-oxo-1H-cyclopenta[a]pentalene-2-carboxylate