['CC(C)(C)N', 'O=CN1CCC2(CCc3ccccc3O2)C1', 'CC(C)(C)NC=O', 'c1ccc2c(c1)CCC1(CCNC1)O2', 'CC(C)C', 'NC(=O)N1CCC2(CCc3ccccc3O2)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCC1(CCNC1)O2.