['CCO', 'CN(CC=O)Cc1cscn1', 'CC', 'CN(CC(=O)O)Cc1cscn1', 'CCOC(C)=O', 'CNCc1cscn1', 'Cc1cscn1', 'CCOC(=O)CNC', 'c1cscn1', 'CCOC(=O)CN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cscn1.