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