Using CC(=O)Cl, COc1cc(OC)nc(Oc2cccc3c2C(=O)OC3O)n1 to produce COc1cc(OC)nc(Oc2cccc3c2C(=O)OC3OC(C)=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.