Using CSc1cccc(-c2nc(N3CCC(C(=O)O)CC3)cc3cccnc23)c1, OO to produce CS(=O)c1cccc(-c2nc(N3CCC(C(=O)O)CC3)cc3cccnc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.