Using O=C1CCC2(c3c[nH]cn3)Cc3ccccc3C12, CC(C)(C)[O-] to produce C=C1CCC2(c3c[nH]cn3)Cc3ccccc3C12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.