spiro((3a,4,5,6,7,8,11,12,13,14,15,15a-dodecahydro-6,10,14-trimethyl-2-oxo-5,15-epoxy-3H-cyclotetradeca(b)furan)-3,3'-1'-pyrazoline)-6-yl acetate
spiro((3a,4,5,6,7,8,11,12,13,14,15,15a-dodecahydro-6,10,14-trimethyl-2-oxo-5,15-epoxy-3h-cyclotetradeca(b)furan)-3,3'-1'-pyrazoline)-6-yl acetate