['CCCCN(CC=O)[C@H](C)CC', 'CN(C)C(=O)c1cccc(N)c1', 'CNC', 'CCCCN(CC(=O)Nc1cccc(C=O)c1)[C@H](C)CC', 'CCCC', 'CC[C@@H](C)NCC(=O)Nc1cccc(C(=O)N(C)C)c1', 'CCCCN[C@H](C)CC', 'CC(=O)Nc1cccc(C(=O)N(C)C)c1', 'CCCC', 'CCCCNCC(=O)Nc1cccc(C(=O)N(C)C)c1', 'CN(C)C(=O)c1ccccc1', 'CCCCN(CC(N)=O)[C@H](C)CC', 'CN(C)C=O', 'CCCCN(CC(=O)Nc1ccccc1)[C@H](C)CC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.