Using COC(=O)C=CCC1CCCCC(=O)N1C(=O)OC(C)(C)C, [Li]CC=C to produce C=CCC(CC(=O)OC)CC1CCCCC(=O)N1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.