You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6-(3,5-dimethylpyrazol-1-yl)-N-[(1-methyl-3-phenylpyrazol-4-yl)methyl]pyrazin-2-amine into its molecular formula.
user
C20H21N7
assistant