('CID100024843', 1),Magnesiumsulfate trihydrate
('CID100024083', 1),Magnesiumsulfate (MgSO4), hydrate
ldiff: defaultdict(<type 'list'>, {'CID100024843': [11], 'CID100024083': [17]})
f1: [11]
f2: [17]
c1: Counter({11: 1})
c2: Counter({17: 1})
The chosen was ... CID100024843