You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-N-[(1R)-1-[5-[2-(5-methyl-1,3,4-thiadiazol-2-yl)ethynyl]-4-oxo-3-phenylquinazolin-2-yl]ethyl]pyrazolo[1,5-a]pyrimidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H21N9O2S
assistant