['CNC(=O)[C@H](C)O', 'Cc1oc(-c2ccccc2)nc1C=O', 'CN', 'Cc1oc(-c2ccccc2)nc1C(=O)O[C@@H](C)C=O', 'CCC(=O)NC', 'Cc1oc(-c2ccccc2)nc1C(=O)O', 'CNC(=O)[C@H](C)OC=O', 'Cc1cnc(-c2ccccc2)o1', 'c1ccccc1', 'CNC(=O)[C@H](C)OC(=O)c1ncoc1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2ncco2)cc1.