Using COc1cc2ncnc(Nc3ccc(Cl)cc3)c2c(N)c1OC, O=CO to produce COc1cc2ncnc3c2c(c1OC)N=CN3c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.