['CC(C)C#N', 'CNCc1nnc(-c2ccc(Br)o2)o1', 'CNCC(C)C#N', 'Cc1nnc(-c2ccc(Br)o2)o1', 'CC(C#N)CN(C)C', 'Brc1ccc(-c2nnco2)o1', 'Brc1ccco1', 'CC(C#N)CN(C)Cc1nnco1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1coc(-c2nnco2)c1.