Showing structure for (2s,4s,7r,8s,9s,12r,13r,16r,17s,18r)-16-(acetyloxy)-2,9,13,17-tetramethyl-7-(4-methyl-2-oxopent-3-en-1-yl)-6-oxo-5-oxapentacyclo[10.8.0.0²,⁹.0⁴,⁸.0¹³,¹⁸]icos-1(20)-ene-17-carboxylic acid