['CN(C)CC(C)(C)CN', 'Cc1sc2nc(CCC=O)[nH]c(=O)c2c1C', 'CN(C)CC(C)(C)C', 'Cc1sc2nc(CCC(N)=O)[nH]c(=O)c2c1C', 'CNC', 'Cc1sc2nc(CCC(=O)NCC(C)(C)C)[nH]c(=O)c2c1C', 'Cc1sc2nc[nH]c(=O)c2c1C', 'CCC(=O)NCC(C)(C)CN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1[nH]cnc2sccc12.