You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(1R,2S,7R,8S,11R,12S,15R,17R)-15-hydroxy-8,15-dimethyl-7-tetracyclo[9.8.0.02,8.012,17]nonadecanyl]ethanone .
user
C23H38O2
assistant