Synonyms: Obacunoicacid, 4-deoxy-4,19-epoxy-6-oxo-, methyl ester;Furo[3',4':5,6]naphth[2,1-c]oxireno[d]pyran, obacunoic acid deriv.; 2-Propenoicacid, 3-[1-(3-furanyl)dodecahydro-4b,7,7,11a-tetramethyl-3,5,6-trioxofuro[3',4':5,6]naphth[2,1-c]oxireno[d]pyran-9a(9H)-yl]-, methyl ester, [1S-[1a,3aa,4aS*,4bb,6aa,9aa(Z),9ba,11aa]]-; Dehydroatalantin