You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3-(2-methylindazol-5-yl)-7-(1,2,3,6-tetrahydropyridin-4-yl)cinnoline;hydrochloride using the IUPAC nomenclature.
user
C21H20ClN5
assistant