Using Cc1nc(-c2cn3c(n2)-c2ccc(Br)cc2OCC3)n(C(C)C)n1, C=CC(=O)OC to produce COC(=O)/C=C/c1ccc2c(c1)OCCn1cc(-c3nc(C)nn3C(C)C)nc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.