['C#CCN', 'CN(C=O)Cc1ccc(Br)cc1', 'C#CCNC=O', 'CNCc1ccc(Br)cc1', 'C#CC', 'CN(Cc1ccc(Br)cc1)C(N)=O', 'Cc1ccc(Br)cc1', 'C#CCNC(=O)NC', 'Brc1ccccc1', 'C#CCNC(=O)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.