['CC(C)CN', 'O=Cc1cc(Cl)c2c(c1)OCCCO2', 'CC(C)C', 'NC(=O)c1cc(Cl)c2c(c1)OCCCO2', 'CC(C)CNC=O', 'Clc1cccc2c1OCCCO2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCCCO2.