You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
but-3-enyl 3-methanimidoyl-2-(3-pyridin-2-ylpropanoylamino)-5,7-dihydro-4H-thieno[2,3-c]pyridine-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N4O3S
assistant