['CCO', 'Cc1ccc2ncc(C=O)c(N(C)C)c2c1', 'CC', 'Cc1ccc2ncc(C(=O)O)c(N(C)C)c2c1', 'CNC', 'CCOC(=O)c1cnc2ccc(C)cc2c1', 'CCOC=O', 'Cc1ccc2nccc(N(C)C)c2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ncccc2c1.