['CNC(=O)[C@H](C)O', 'COc1ccc(C=O)c2ccccc12', 'CN', 'COc1ccc(C(=O)O[C@@H](C)C=O)c2ccccc12', 'CCC(=O)NC', 'COc1ccc(C(=O)O)c2ccccc12', 'CO', 'CNC(=O)[C@H](C)OC(=O)c1cccc2ccccc12', 'CNC(=O)[C@H](C)OC=O', 'COc1cccc2ccccc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ccccc2c1.