['CO', 'COc1ccccc1[C@H](C)NC[C@@H](C#N)CCC#N', 'COc1cccc([C@H](C)NC[C@@H](C#N)CCC#N)c1', 'N#CCC[C@H](C#N)CN', 'CCc1cc(OC)ccc1OC', 'C[C@@H](C#N)CCC#N', 'COc1ccc(OC)c([C@H](C)N)c1', 'COc1ccc(OC)cc1', 'CCNC[C@@H](C#N)CCC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.