(1aS,4E,10aS,11E,14aS)-1a,5,8,12-tetramethyl-2,3,6,7,10a,13,14,14a-octahydrooxireno[9,10]cyclotetradeca[1,2-b]furan-9(1aH)-one InChI=1/C20H28O3/c1-13-6-5-11-20(4)18(23-20)10-8-14(2)12-17-16(9-7-13)15(3)19(21)22-17/h6,12,17-18H,5,7-11H2,1-4H3/b13-6+,14-12+/t17-,18-,20-/m0/s oxireno[9,10]cyclotetradeca[1,2-b]furan-9(1aH)-one, 2,3,6,7,10a,13,14,14a-octahydro-1a,5,8,12-tetramethyl-, (1aS,4E,10aS,11E,14aS)-