['C[C@@H]1CCCO1', 'Cc1cn2nc(N)sc2n1', 'NC[C@@H]1CCCO1', 'Cc1cn2ncsc2n1', 'C1CCOC1', 'CNc1nn2cc(C)nc2s1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn2nc(NC[C@@H]3CCCO3)sc2n1.