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 (5aS,10bR)-9-(3-fluorophenyl)sulfonyl-3-methyl-2,4,5,5a,6,10b-hexahydro-1H-azepino[4,5-b]indole ?
user
C19H21FN2O2S
assistant