['C#CCN', 'Cc1ccc(C)c(OCCCCC=O)c1', 'Cc1ccc(C)c(O)c1', 'C#CCNC(=O)CCCC', 'Cc1ccc(C)cc1', 'C#CCNC(=O)CCCCO', 'C#CC', 'Cc1ccc(C)c(OCCCCC(N)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.