['CC(=O)NCCC=O', 'COc1ccc(S(N)(=O)=O)cc1C', 'CC=O', 'COc1ccc(S(=O)(=O)NC(=O)CCN)cc1C', 'CO', 'CC(=O)NCCC(=O)NS(=O)(=O)c1cccc(C)c1', 'CC(N)=O', 'CCC(=O)NS(=O)(=O)c1ccc(OC)c(C)c1', 'CC(=O)NCCC(N)=O', 'COc1ccc([SH](=O)=O)cc1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.