Using O=C(COCc1ccccc1)N1CCC(O)(c2ccc(Cl)cc2Cl)CC1 to produce O=C(COCc1ccccc1)N1CC=C(c2ccc(Cl)cc2Cl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.