Using C=CCC1(C(C)CCC)C(=O)[N-]C(=O)NC1=O, O=[O+][O-] to produce CCCC(C)C1(CC=O)C(=O)NC(=O)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.