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 ethyl 5-amino-4-cyano-3-[[2-(1-methylidene-3-oxoisoindol-2-yl)acetyl]oxymethyl]thiophene-2-carboxylate .
user
C20H17N3O5S
assistant