(2aS,4R,4aS,6Z,10aR,12aR,12bS)-4,4a,12b-trimethyl-2a,3,4,4a,5,9a,10a,11,12,12a,12b,12c-dodecahydro-1H-furo[3,2-g]furo[4',3',2':4,5]naphtho[1,8-bc]oxocin-1-one 1H-furo[3,2-g]furo[4',3',2':4,5]naphth[1,8-bc]oxocin-1-one, 2a,3,4,4a,5,9a,10a,11,12,12a,12b,12c-dodecahydro-4,4a,12b-trimethyl-, (2aS,4R,4aS,6Z,10aR,12aR,12bS)- 1beta,16:15,16-Diepoxy-cis-ent-cleroda-12,14-dien-18alpha,6alpha-olide InChI=1/C20H26O4/c1-11-10-15-20(3)13(17(21)24-15)4-5-14-16(20)19(11,2)8-6-12-7-9-22-18(12)23-14/h6-7,9,11,13-16,18H,4-5,8,10H2,1-3H3/b12-6-/t11-,13+,14-,15+,16?,18?,19+,20+/m1/s