['CCC', 'O=C(c1ccc(O)nc1)N1CCCCCO1', 'CC(C)O', 'O=C(c1cccnc1)N1CCCCCO1', 'O=CN1CCCCCO1', 'CC(C)Oc1ccccn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(c1cccnc1)N1CCCCCO1.