Using C=C(OCC)c1cc2c(cc1C)-c1nc(-c3ncnn3C(C)C)cn1CCO2 to produce CC(=O)c1cc2c(cc1C)-c1nc(-c3ncnn3C(C)C)cn1CCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.