Using COC(=O)[C@H](Cc1cn(C(=O)OC(C)(C)C)cn1)NC(=O)OC(C)(C)C, OCCC12CC3CC(CC(C3)C1)C2 to produce COC(=O)[C@H](Cc1cncn1CCC12CC3CC(CC(C3)C1)C2)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.