['C[C@H]1COCCN1', 'CC(=O)/C=C1/N(C)c2ccccc2C1(C)C', 'CC(=O)CN1CCOC[C@@H]1C', 'CN1CC(C)(C)c2ccccc21']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(/C=C1\Cc2ccccc2N1)CN1CCOCC1.