You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methoxy-2-(methoxymethyl)-5-methyl-N-[1-(4-morpholin-4-ylphenyl)ethyl]thieno[2,3-d]pyrimidine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H28N4O4S
assistant