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 N-[(2-chlorophenyl)methyl]-3-(7-oxo-8-propyl-5-thia-1,8,10,11-tetrazatricyclo[7.3.0.02,6]dodeca-2(6),3,9,11-tetraen-12-yl)propanamide .
user
C20H20ClN5O2S
assistant