Using BrCC1CC1, CCOC(=O)c1sc(-n2ccc(O)cc2=O)nc1C to produce CCOC(=O)c1sc(-n2ccc(OCC3CC3)cc2=O)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.