You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[[4-[12-methyl-8-(methylamino)-3-thia-5,7,10,12-tetrazatricyclo[7.3.0.02,6]dodeca-1(9),2(6),4,7,10-pentaen-4-yl]phenyl]methyl]-5-oxopyrrolidine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21N7O2S
assistant