You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 8-(3-aminopiperidin-1-yl)-1-methyl-7-(3-methylbut-2-enyl)-3-(3-methyl-2-oxobutyl)purine-2,6-dione into its molecular formula.
user
C21H32N6O3
assistant