Using COCCc1cc(O)ccc1-c1ccc2c(-c3nc4ccccc4[nH]3)n[nH]c2c1 to produce OCCc1cc(O)ccc1-c1ccc2c(-c3nc4ccccc4[nH]3)n[nH]c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.