['CC(C)CN', 'Cc1c(C=O)sc2nc3n(c(=O)c12)CCCCC3', 'CC(C)C', 'Cc1c(C(N)=O)sc2nc3n(c(=O)c12)CCCCC3', 'CC(C)CNC=O', 'Cc1csc2nc3n(c(=O)c12)CCCCC3']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1c2ccsc2nc2n1CCCCC2.