Using O=C1OC2(CCN(Cc3ccccc3)CC2)C(c2ccccc2)c2ccccc21 to produce O=C1OC2(CCNCC2)C(c2ccccc2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.