['CC(C)CN', 'CCCc1n[nH]c(=S)n1CC=O', 'CC(C)C', 'CCCc1n[nH]c(=S)n1CC(N)=O', 'CC(=O)NCC(C)C', 'CCCc1n[nH]c(=S)[nH]1', 'CCC', 'CC(C)CNC(=O)Cn1cn[nH]c1=S']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is S=c1[nH]cn[nH]1.