You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(9H-fluoren-3-yl)-2-oxoethyl] (2R)-2-[(3,4-dichlorophenyl)sulfonylamino]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H19Cl2NO5S
assistant