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 1-(7-butyl-1,3-dimethyl-2,4-dioxopyrrolo[2,3-d]pyrimidine-6-carbonyl)piperidine-4-carboxamide ?
user
C19H27N5O4
assistant