Using O=S(Cl)Cl, COCn1c(=O)c2c(c3ccc(CO)cc31)NCCC2 to produce COCn1c(=O)c2c(c3ccc(CCl)cc31)NCCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.