You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [4-(hydroxymethyl)piperidin-1-yl]-[8-(1H-pyrazol-4-yl)-4,5-dihydro-[1]benzoxepino[5,4-d][1,3]thiazol-2-yl]methanone into its molecular formula.
user
C21H22N4O3S
assistant