You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-oxo-2-phenyl-N-[1-(thiophen-2-ylmethyl)piperidin-4-yl]-1H-pyrazole-5-carboxamide into its molecular formula.
user
C20H22N4O2S
assistant