Using O=S1(=O)OCCO1, C[C@H]1COCCN1c1nc(Cl)cc(Cl)n1 to produce C[C@H]1COCCN1c1nc(Cl)c(CCO)c(Cl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.