You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [(1R,4aR,7S)-7-ethenyl-1,4a,7-trimethyl-3,4,6,8,8a,9,10,10a-octahydro-2H-phenanthren-1-yl]methyl 4-methoxybenzenesulfonate ?
user
C27H38O4S
assistant