('CID100010518', 3),Heptabarbital
('CID100010518', 3),Heptabarbital sodium
('CID100010518', 3),Heptabarbital sodium
('CID100528900', 2),Heptabarbital M (oh, -h2o)
('CID100528900', 2),Heptabarbital M (OH, -H2O)
ldiff: defaultdict(<type 'list'>, {'CID100528900': [13, 13], 'CID100010518': [0, 7, 7]})
f1: [0, 7, 7]
f2: [13, 13]
c1: Counter({7: 2, 0: 1})
c2: Counter({13: 2})
The chosen was ... CID100010518