You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-methyl-3-[[(2-phenyl-4,5,6,7-tetrahydroindazol-4-yl)amino]methyl]-1,5,7,8-tetrahydro-1,6-naphthyridin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N5O
assistant