('CID100008053', 1),Amylnitrite
('CID100243476', 1), tert-Amylnitrite
ldiff: defaultdict(<type 'list'>, {'CID100008053': [0], 'CID100243476': [6]})
f1: [0]
f2: [6]
c1: Counter({0: 1})
c2: Counter({6: 1})
The chosen was ... CID100008053