You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-(1-phenylethylcarbamoyl)-1,4,6,7-tetrahydropyrazolo[4,3-c]pyridine-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26N4O3
assistant