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 (2S,4R)-4-[(5-chlorothiophene-2-carbonyl)amino]-1-(2-methyl-1,3-dihydroisoindole-5-carbonyl)pyrrolidine-2-carboxylic acid .
user
C20H20ClN3O4S
assistant