Using CC1CN(C(=O)OC(C)(C)C)Cc2sc(Br)c(C(C)C)c2O1, CB(O)O to produce Cc1sc2c(c1C(C)C)OC(C)CN(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.