['CO', 'C[C@@H]1CN(C2=NC(=O)/C(=C\\c3ccccc3)S2)C[C@H](C)O1', 'COc1ccc(C)cc1', 'C[C@@H]1CN(C2=NC(=O)CS2)C[C@H](C)O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1N=C(N2CCOCC2)S/C1=C/c1ccccc1.