You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-[5-(2-chlorophenyl)pyrazolidine-3-carbonyl]-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrole-3-carboxylic acid ?
user
C18H22ClN3O3
assistant