159194-94-2 7aH-Indeno[5,6-b]furan-4,7a-dicarboxylicacid, 4,4a,5,6,7,8-hexahydro-4a,7-dimethyl-, dimethyl ester, [4S-(4a,4aa,7a,7aa)]- 159194-96-4 7aH-Indeno[5,6-b]furan-7a-carboxylicacid, 4,4a,5,6,7,8-hexahydro-4a,7-dimethyl-4,6-dioxo-, methyl ester, [4aR-(4aa,7a,7aa)]-