You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3-[(3-chloro-4-fluorophenyl)methyl]-N-(4-hydroxybutyl)-5-methoxy-N-methyl-4,6-dioxo-7H-pyrido[3,4-d]pyrimidine-8-carboxamide ?
user
C21H22ClFN4O5
assistant