['CC(C)C', 'Oc1cncc(N2CC3COCC(C2)O3)n1', 'CC(C)CO', 'c1cnc(N2CC3COCC(C2)O3)cn1', 'C1NCC2COCC1O2', 'CC(C)COc1cnccn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnc(N2CC3COCC(C2)O3)cn1.