Showing structure for (1r,2r,4s,7r,8s,11s,12r,18s)-7-[(2s)-2-hydroxy-5-oxo-2h-furan-3-yl]-1,8,12,17,17-pentamethyl-3,6,16-trioxapentacyclo[9.9.0.0²,⁴.0²,⁸.0¹²,¹⁸]icos-13-ene-5,15,20-trione