['CC[C@@H](N)CO', 'O=Cc1sc2ccccc2c1Cl', 'CCCCO', 'NC(=O)c1sc2ccccc2c1Cl', 'CC[C@H](CO)NC=O', 'Clc1csc2ccccc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2sccc2c1.