Using COc1cc(Cc2cnc(N)nc2N)c2c(c1OC)OC(C)C=C2 to produce COc1cc(Cc2cnc(N)nc2N)c2c(c1OC)OC(C)=CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.