You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,2S,10S,13S,14R,19R)-1,5,10,14,18,18-hexamethylpentacyclo[11.8.0.02,10.03,8.014,19]henicosa-3(8),5-diene-4,7,17-trione .
user
C27H36O3
assistant