Using COc1cc(Cc2cnc(N)nc2N)c2cc(C3(c4ccccc4)OCCO3)oc2c1OC to produce COc1cc(Cc2cnc(N)nc2N)c2cc(C(=O)c3ccccc3)oc2c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.