Using COCn1c(C)nc2c(OCc3ccccc3)cc(C(=O)N(C)C)cc21 to produce COCn1c(C)nc2c(O)cc(C(=O)N(C)C)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.