You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(2R,4R,6S)-2-[4-[(1,3-dioxoisoindol-2-yl)methyl]phenyl]-6-[4-(hydroxymethyl)phenyl]-1,3-dioxan-4-yl]methylsulfanyl]pyridine-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H28N2O7S
assistant