Using COC(C)(C)C(NC(=O)OC(C)(C)C)C(=O)O, Cc1ncc2n1C(=O)N(C1CCNCC1)C2 to produce COC(C)(C)C(NC(=O)OC(C)(C)C)C(=O)N1CCC(N2Cc3cnc(C)n3C2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.