['CC(C)(C)O', 'O=CN1C[C@H]2CC(C(=O)O)C[C@@H](C1)C2O', 'CC(C)(C)OC=O', 'O=C(O)C1C[C@H]2CNC[C@@H](C1)C2O', 'CC(C)C', 'O=C(O)C1C[C@@H]2CN(C(=O)O)C[C@H](C1)C2O', 'O=CO', 'CC(C)(C)OC(=O)N1C[C@H]2CCC[C@@H](C1)C2O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1C[C@@H]2CNC[C@H](C1)C2.