2-[(1S,2S,10S,11S,15S,17S)-2,15-dimethyl-5-oxo-18-oxapentacyclo[8.8.0.0^{1,17}.0^{2,7}.0^{11,15}]octadeca-3,6,13-trien-14-yl]-2-oxoethyl acetate
2-[(1S,2S,10S,11S,15S,17S)-2,15-dimethyl-5-oxo-18-oxapentacyclo[8.8.0.0^{1,17}.0^{2,7}.0^{11,15}]octadeca-3,6,13-trien-14-yl]-2-oxoethyl acetate