Using CCOC(=O)CBr, Oc1cccc(/C=C/c2nc3ccccc3s2)c1 to produce CCOC(=O)COc1cccc(/C=C/c2nc3ccccc3s2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.