Using CCOC(=O)CC12CC(=O)Nc3cccc(c31)N(C(=O)OC(C)(C)C)C2 to produce CC(C)(C)OC(=O)N1CC2(CC=O)CC(=O)Nc3cccc1c32, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.