['CC(C)COCCCN', 'O=CNCc1nc2ccccc2s1', 'CC(C)COCCCNC=O', 'NCc1nc2ccccc2s1', 'CC(C)C', 'O=C(NCCCO)NCc1nc2ccccc2s1', 'CC(C)CO', 'CCCNC(=O)NCc1nc2ccccc2s1', 'CCCOCC(C)C', 'NC(=O)NCc1nc2ccccc2s1', 'Cc1nc2ccccc2s1', 'CC(C)COCCCNC(N)=O', 'c1ccc2scnc2c1', 'CNC(=O)NCCCOCC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.