Using CCCN(CC1CC1)c1cc(C(=O)Nc2ccc3[nH]nc(CCC(=O)OC)c3c2)ncn1 to produce CCCN(CC1CC1)c1cc(C(=O)Nc2ccc3[nH]nc(CCC(=O)O)c3c2)ncn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.