2-[(1R,2S,8S,10S,11S,13S,14R,15S,17S)-14-(acetyloxy)-1,8-difluoro-17-hydroxy-2,13,15-trimethyl-5-oxotetracyclo[8.7.0.0?,?.0??,??]heptadeca-3,6-dien-14-yl]-2-oxoethyl acetate
2-[(1R,2S,8S,10S,11S,13S,14R,15S,17S)-14-(acetyloxy)-1,8-difluoro-17-hydroxy-2,13,15-trimethyl-5-oxotetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadeca-3,6-dien-14-yl]-2-oxoethyl acetate
2-[(1R,2S,8S,10S,11S,13S,14R,15S,17S)-14-(acetyloxy)-1,8-difluoro-17-hydroxy-2,13,15-trimethyl-5-oxotetracyclo[8.7.0.02,7.011,15]heptadeca-3,6-dien-14-yl]-2-oxoethyl acetate