You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-3-(1H-imidazol-2-yl)-4-methyl-N-(2-pyrazol-1-ylethyl)piperazine-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H21N7O
assistant