['CC(C)(C)N', 'CN(CC=O)C(=O)NC1CCCN(S(C)(=O)=O)C1', 'CNCC(=O)NC(C)(C)C', 'CS(=O)(=O)N1CCCC(NC=O)C1', 'CS(=O)(=O)N1CCCC(N)C1', 'CN(C=O)CC(=O)NC(C)(C)C', 'CC(=O)NC(C)(C)C', 'CNC(=O)NC1CCCN(S(C)(=O)=O)C1', 'CC(C)C', 'CN(CC(N)=O)C(=O)NC1CCCN(S(C)(=O)=O)C1', 'C[SH](=O)=O', 'CN(CC(=O)NC(C)(C)C)C(=O)NC1CCCNC1', 'CS(=O)(=O)N1CCCCC1', 'CN(CC(=O)NC(C)(C)C)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.