(2R,3aR,4S,6R,6aR,7S,9aS,9bS)-3a,4,6a-trimethyl-8-oxo-2-(5-oxo-2,5-dihydrofuran-3-yl)decahydro-2H-spiro[benzo[de]chromene-7,2'-oxiran]-6-yl rel-acetate InChI=1/C22H28O7/c1-11-5-17(28-12(2)23)21(4)19-14(7-16(24)22(21)10-27-22)29-15(8-20(11,19)3)13-6-18(25)26-9-13/h6,11,14-15,17,19H,5,7-10H2,1-4H3/t11-,14-,15+,17+,19-,20+,21-,22-/m1/s spiro[naphtho[1,8-bc]pyran-7(8H),2'-oxiran]-8-one, 6-(acetyloxy)-2-(2,5-dihydro-5-oxo-3-furanyl)decahydro-3a,4,6a-trimethyl-, (2S,3aS,4R,6S,6aS,7R,9aR,9bR)-