Using O=C(NCCOc1cccc(-c2n[nH]c3ccc(-c4ncn[nH]4)cc23)c1)OCc1ccccc1 to produce NCCOc1cccc(-c2n[nH]c3ccc(-c4ncn[nH]4)cc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.