You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-3-(3,6-dichlorocarbazol-9-yl)-2-hydroxypropyl]-4-methyl-N-phenylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H24Cl2N2O3S
assistant