You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1-ethyl-5-methylpyrazol-4-yl)-[(3R)-3-[1-(pyridin-4-ylmethyl)imidazol-2-yl]piperidin-1-yl]methanone ?
user
C21H26N6O
assistant