You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by N-[2-(2-amino-1,4-dimethyl-6-oxo-5H-pyrimidin-4-yl)pyridin-4-yl]-5-(2-methylsulfanylethoxy)pyrazine-2-carboxamide ?
user
C19H23N7O3S
assistant