You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-3-[[2-[(11-methyl-12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-10-yl)sulfanyl]acetyl]amino]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N4O3S2
assistant