Using C=CC(C)=O, O=C(O)CC(C(=O)O)C1C(=O)N=C2C=CC=CN21 to produce CC(=O)CCC1(C(CC(=O)O)C(=O)O)C(=O)N=C2C=CC=CN21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.