You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[4-(benzenesulfonyl)phenyl]-6-methoxy-7-[2-[methyl(2-methylsulfonylethyl)amino]ethyl]-8H-pyrido[3,4-d]pyrimidin-4-amine .
user
C26H31N5O5S2
assistant