['CO', 'CC(C)CC(NC=O)C(=O)NCc1nnc2n1CCCCC2', 'COC=O', 'CC(C)CC(N)C(=O)NCc1nnc2n1CCCCC2', 'COC(=O)NC(C=O)CC(C)C', 'NCc1nnc2n1CCCCC2', 'COC(N)=O', 'CC(C)CCC(=O)NCc1nnc2n1CCCCC2', 'Cc1nnc2n1CCCCC2', 'COC(=O)NC(CC(C)C)C(N)=O', 'c1nnc2n1CCCCC2', 'CNC(=O)C(CC(C)C)NC(=O)OC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nnc2n1CCCCC2.