Using CCN=C=NCCCN(C)C, CC(C)(C)OC(=O)n1cc(CCCC(=O)O)nc1N to produce CC(C)(C)OC(=O)n1cc(CCCC(=O)Nc2ncccn2)nc1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.