Using O=C(O)CC(O)(CC(=O)O)C(=O)O, C=CCC(C#N)c1ccc(Cl)c(Cl)c1 to produce C=CCC(C=O)c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.