You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[4-oxo-2-phenyl-3-(pyridin-4-ylmethyl)-1,3-thiazolidin-5-yl]acetic acid by IUPAC nomenclature, provide its molecular formula.
user
C17H16N2O3S
assistant