Showing structure for (4r)-4-[(1s,2r,5r,6r,9r,10r,13s,15s)-13-hydroxy-6,10-dimethyl-16,17-dioxapentacyclo[13.2.2.0¹,⁹.0²,⁶.0¹⁰,¹⁵]nonadec-18-en-5-yl]pentanoic acid