You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1-ethylimidazol-2-yl)methyl]-4-[4-methyl-5-[(2-methylimidazol-1-yl)methyl]-1,2,4-triazol-3-yl]piperidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H28N8
assistant