['CO', 'Cc1cccc2nc(NCCCN(C)C)sc12', 'CCCN(C)C', 'COc1ccc(C)c2sc(N)nc12', 'CNC', 'CCCNc1nc2c(OC)ccc(C)c2s1', 'CN(C)CCCN', 'COc1ccc(C)c2scnc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.