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 [(3R,7S)-8-benzyl-9,9-dioxo-2-oxa-9lambda6-thia-5,8,14-triazatricyclo[8.4.0.03,7]tetradeca-1(10),11,13-trien-5-yl]-(2-methylpyrazol-3-yl)methanone .
user
C21H21N5O4S
assistant