Using [Li]CCCC, CC(C)(C=O)C[C@H]1COC(C)(C)N1C(=O)OC(C)(C)C to produce C=CC(C)(C)C[C@H]1COC(C)(C)N1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.