You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-oxo-1-[(4-phenyl-1,3-thiazol-2-yl)amino]propan-2-yl] 5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidine-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18N6O3S
assistant