['CCO', 'Cc1c(C=O)oc2c1C1(CC(C)(C)C2)SCCS1', 'CC', 'Cc1c(C(=O)O)oc2c1C1(CC(C)(C)C2)SCCS1', 'CCOC=O', 'Cc1coc2c1C1(CC(C)(C)C2)SCCS1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc2c(o1)CCCC21SCCS1.