['N#CCCNCCC#N', 'CN(CC=O)C1=NS(=O)(=O)c2ccccc21', 'CC(=O)N(CCC#N)CCC#N', 'CNC1=NS(=O)(=O)c2ccccc21', 'CCC#N', 'CN(CC(=O)NCCC#N)C1=NS(=O)(=O)c2ccccc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)N=Cc2ccccc21.