You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl 2-[[2-[4-(4-chlorophenyl)sulfonylpiperazin-1-yl]acetyl]amino]-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate ?
user
C22H26ClN3O5S2
assistant