Using C=CCc1c(O)c(Br)cc2c1[C@H](CCNC(=O)CC)CC2, O=[O+][O-] to produce CCC(=O)NCC[C@@H]1CCc2cc(Br)c(O)c(CCO)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.