You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl-[4-methyl-2-[methyl-[2-(4-pyridin-2-ylphenyl)acetyl]amino]-1,3-thiazol-5-yl]phosphinic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N3O3PS
assistant