You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [2-(2-ethoxyanilino)-2-oxoethyl] (5R)-5-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxylate .
user
C20H23NO4S
assistant