You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6aS,7S)-7-amino-2-(4-methylsulfanylphenyl)-6a,7,8,9-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-6,11-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N3O2S
assistant