You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(cyclohexylamino)-5-[(7-methyl-1-propan-2-ylindazol-5-yl)amino]-1,2,4-triazine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H28N8O
assistant