Using CC(C)(C)OC(=O)OC(=O)OC(C)(C)C, C=CCCC(C)C[C@@H](CC)C(N)C(=O)OCC to produce C=CCCC(C)C[C@@H](C)C(NC(=O)OC(C)(C)C)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.