Using COc1cccc(COc2cccc(C(=O)O)c2C(=O)O)c1, NC1CCC(=O)NC1=O to produce COc1cccc(COc2cccc3c2C(=O)N(C2CCC(=O)NC2=O)C3=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.