['CC(C)(C)O', 'O=CNCCn1cccc1', 'CC(C)(C)OC=O', 'NCCn1cccc1', 'CC(C)C', 'O=C(O)NCCn1cccc1', 'CCn1cccc1', 'CC(C)(C)OC(N)=O', 'c1cc[nH]c1', 'CCNC(=O)OC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc[nH]c1.