Using ClCc1cnc(Cl)s1, OCC1COC2(CCN(CCc3ccccc3)CC2)O1 to produce Clc1ncc(COCC2COC3(CCN(CCc4ccccc4)CC3)O2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.