You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(cyclopropylamino)-N-[4-[2-(1,2,4-triazol-1-yl)propanoylamino]phenyl]pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H21N7O2
assistant