['CC(C)(C)CC(=O)NCC=O', 'Cc1cnc2c(S(N)(=O)=O)cccc2c1', 'CC(C)(C)CC=O', 'Cc1cnc2c(S(=O)(=O)NC(=O)CN)cccc2c1', 'CC(C)(C)CC(N)=O', 'CC(=O)NS(=O)(=O)c1cccc2cc(C)cnc12', 'CC(C)(C)CC(=O)NCC(N)=O', 'Cc1cnc2c([SH](=O)=O)cccc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ncccc2c1.