You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [2-[(2-fluorophenyl)-hydroxymethyl]-5-methyl-1,3-oxazol-4-yl]-(4-pyridin-2-ylpiperazin-1-yl)methanone into molecular formula.
user
C21H21FN4O3
assistant