Showing structure for (1s,6s,8s,11r,12s,15s,16r,19s,21r)-8,19-dimethoxy-1,7,7,11,16,20,20-heptamethylpentacyclo[13.8.0.0³,¹².0⁶,¹¹.0¹⁶,²¹]tricos-3-ene