Using O=C(CCl)c1cc2c(s1)SCCc1cc(=O)n(-c3ccc(Cl)cc3)nc1-2, CC(=O)[O-] to produce CC(=O)OCC(=O)c1cc2c(s1)SCCc1cc(=O)n(-c3ccc(Cl)cc3)nc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.