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 [(1S,11R,12S,17S,18S)-5-hydroxy-1,4,8,12,16,16-hexamethyl-10-oxo-18-tetracyclo[9.8.0.02,7.012,17]nonadeca-2(7),3,5,8-tetraenyl] acetate .
user
C27H36O4
assistant