Using O=C(Oc1ccc2c(c1)c1c(n2C(=O)c2ccccc2)CCC(C(=O)O)C1)c1ccccc1 to produce O=C(O)C1CCc2c(c3cc(O)ccc3n2C(=O)c2ccccc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.