Using CCCc1c(OCCCOc2cccc(NC(=O)C(=O)OCC)c2)ccc(C(C)=O)c1OC to produce CCCc1c(OCCCOc2cccc(NC(=O)C(=O)OCC)c2)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.