You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(3-ethoxycarbonyl-5-ethyl-4-methylthiophen-2-yl)amino]-2-oxoethyl] 5,6-dihydro-4H-cyclopenta[b]thiophene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H23NO5S2
assistant