['CNC1CC1', 'CCCN(CC=O)CCO', 'CCC', 'CN(C(=O)CNCCO)C1CC1', 'CCO', 'CCCNCC(=O)N(C)C1CC1', 'CCCNCCO', 'CC(=O)N(C)C1CC1', 'C1CC1', 'CCCN(CCO)CC(=O)NC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC1.