You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-[4-[4-[(5-phenylthiophene-3-carbonyl)amino]phenyl]piperidin-1-yl]pyridine-3-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C28H25N3O3S
assistant