['N#CCCNCCC#N', 'Cc1sc2nc(CSC(C)C=O)[nH]c(=O)c2c1C', 'CCC#N', 'Cc1sc2nc(CSC(C)C(=O)NCCC#N)[nH]c(=O)c2c1C', 'Cc1nc2sc(C)c(C)c2c(=O)[nH]1', 'CC(S)C(=O)N(CCC#N)CCC#N', 'CCC(=O)N(CCC#N)CCC#N', 'Cc1sc2nc(CS)[nH]c(=O)c2c1C', 'Cc1sc2nc[nH]c(=O)c2c1C', 'CSC(C)C(=O)N(CCC#N)CCC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1[nH]cnc2sccc12.