You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[2-(2-oxo-6-phenyl-10-thia-1,5,6,8-tetrazatricyclo[7.3.0.03,7]dodeca-3(7),4,8-trien-12-yl)acetyl]piperidine-4-carboxamide .
user
C21H22N6O3S
assistant