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,11S)-9-methyl-12-(4-methylphenyl)sulfonyl-2-oxa-9,12-diazatricyclo[9.2.1.03,8]tetradeca-3,5,7-trien-10-one .
user
C19H20N2O4S
assistant