You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
benzyl N-[1-(3,6-diethoxy-5-propan-2-yl-2,5-dihydropyrazin-2-yl)but-2-ynyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31N3O4
assistant