Using COc1ccc2c(c1)C(Cc1c[nH]cn1)C(c1ccccc1)C2 to produce Oc1ccc2c(c1)C(Cc1c[nH]cn1)C(c1ccccc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.