('CID100447077', 1),PD173955
('CID116722154', 1),PD173955 aminomethyl analogue
ldiff: defaultdict(<type 'list'>, {'CID100447077': [0], 'CID116722154': [21]})
f1: [0]
f2: [21]
c1: Counter({0: 1})
c2: Counter({21: 1})
The chosen was ... CID100447077