NSC712401 Pentanedioic acid, 3-hydroxy-3-methyl-, mono[(3R,3aR,5aR,8R, 9aR,9bS)-3-[(2R,6S)-6-[1-(4,5-dihydro-5,5-dimethyl-4-oxo-2- furanyl)ethenyl]-5,6-dihydro-2-hydroxy-2H-pyran-3-yl]dodeca~ hydro-3a,6,6,9a-tetramethyl-7-oxo-1H-benz[e]inden-8-yl] ester, rel-(-)- Sodagnitin C