You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[3-[(6-ethoxypyridin-3-yl)amino]-4-[ethyl(oxan-4-yl)amino]phenyl]pentanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C25H35N3O4
assistant