Using COC(=O)c1c(Sc2nc(OC)cc(OC)n2)cccc1C(C)=O, CON to produce CON=C(C)c1cccc(Sc2nc(OC)cc(OC)n2)c1C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.