You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[3-butyl-7-(2-methylpropyl)-2,6-dioxopurin-8-yl]-N-[3-(1-phenylethoxy)propyl]propanamide into its molecular formula.
user
C27H39N5O4
assistant