['CC(C)C', 'CC(C)CNCc1nc2sc3c(c2c(=O)[nH]1)CCC3', 'CC(C)CNCC(C)C', 'Cc1nc2sc3c(c2c(=O)[nH]1)CCC3', 'CC(C)CN(C)CC(C)C', 'O=c1[nH]cnc2sc3c(c12)CCC3']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1[nH]cnc2sc3c(c12)CCC3.