['O=S1(=O)CCCCN1', 'Cc1nnc(C(C)C)o1', 'CCC', 'O=S1(=O)CCCCN1Cc1nnco1', 'CC(C)c1nnco1', 'CN1CCCCS1(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCCCN1Cc1nnco1.