Using CCc1nn(C2CCCC2)c2cc(-c3ccnn3-c3ccc(C(=O)O)cc3)ccc12, CCNCC to produce CCc1nn(C2CCCC2)c2cc(-c3ccnn3-c3ccc(C(=O)N(CC)CC)cc3)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.