You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-[5-(acetamidomethyl)thiophen-2-yl]-1,3-thiazol-2-yl]-2-phenylpyrimidine-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H17N5O2S2
assistant