You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6-amino-1-butyl-2,4-dioxopyrimidin-5-yl)-N-ethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O3S
assistant