('CID100170119', 1),1,N(6)-Etheno-NAD
('CID105288160', 1),ETHENO-NAD
ldiff: defaultdict(<type 'list'>, {'CID100170119': [7], 'CID105288160': [0]})
f1: [7]
f2: [0]
c1: Counter({7: 1})
c2: Counter({0: 1})
The chosen was  ... CID105288160