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 [5-(4-chlorophenyl)sulfonyl-1-methyl-6,7-dihydro-4H-pyrazolo[4,3-c]pyridin-3-yl]-morpholin-4-ylmethanone .
user
C18H21ClN4O4S
assistant