Using CCOC(=O)c1ccc(CBr)cc1, CCCc1c(CSc2nnc(S)s2)ccc(C(C)=O)c1O to produce CCCc1c(CSc2nnc(SCc3ccc(C(=O)OCC)cc3)s2)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.