Using CCOC(=O)c1cnn(-c2nc3c(Br)c(Cl)c(Cl)cc3n2COCCOC)c1 to produce CCOC(=O)c1cnn(-c2nc3c(Br)c(Cl)c(Cl)cc3[nH]2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.