Using O=c1cc(-c2ccc(O)c3c2Sc2ccccc2S3)oc(N2CCOCC2)c1, COC(=O)CBr to produce COC(=O)COc1ccc(-c2cc(=O)cc(N3CCOCC3)o2)c2c1Sc1ccccc1S2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.