Using O=C1CCc2c(-c3ccc(Cl)cc3)cn3cccc1c23, CC(C)(C)[O-] to produce C=C1CCc2c(-c3ccc(Cl)cc3)cn3cccc1c23, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.