Showing structure for (1r,2r,5s,8r,9r,10r,13r,14r,15s,16s,18r)-15-formyl-16-hydroxy-1,2,14,17,17-pentamethyl-8-(prop-1-en-2-yl)pentacyclo[11.7.0.0²,¹⁰.0⁵,⁹.0¹⁴,¹⁸]icosane-5-carboxylic acid