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 methyl (1R,12R,14R)-14-(benzenesulfonyl)-3,15-diazatetracyclo[10.2.1.02,10.04,9]pentadeca-2(10),4,6,8-tetraene-12-carboxylate .
user
C21H20N2O4S
assistant