Using Cc1cc(C(=O)O)c(C)c2c1S(=O)(=O)CCC2=O, SCCS to produce Cc1cc(C(=O)O)c(C)c2c1S(=O)(=O)CCC21SCCS1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.