['CC(C)(C)O', 'N=C1S[C@@H]2CN(C=O)CCC2=C1C(N)=O', 'CC(C)(C)OC=O', 'N=C1S[C@@H]2CNCCC2=C1C(N)=O', 'CC(C)C', 'N=C1S[C@@H]2CN(C(=O)O)CCC2=C1C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is N=C1C=C2CCNC[C@H]2S1.