Using [Li]CCCC, CC(C)(C)OC(=O)N1[C@@H]2CC[C@H]1CC(=O)C2 to produce C=C1CC2CCC(C1)N2C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.