Showing structure for (1s,2s,5s,9r,13s,14s,19r)-1,14,17,17-tetramethyl-6-methylidene-8,16,18-trioxapentacyclo[11.8.0.0²,¹⁰.0⁵,⁹.0¹⁴,¹⁹]henicos-10-ene