Showing structure for (1r,2r,4s,7s,8s,11r,12r,13r,18r)-7-(furan-3-yl)-1,8,12,17,17-pentamethyl-5,15,20-trioxo-3,6,16-trioxapentacyclo[9.9.0.0²,⁴.0²,⁸.0¹²,¹⁸]icosan-13-yl acetate