('CID100008060', 5),Amylamine
('CID100008060', 5),Amylamines, mixture of isomers
('CID100008060', 5),n-Amylamine
('CID100008060', 5),N-AMYLAMINE
('CID100008060', 5),N-AMYLAMINE
('CID100025805', 4),Nitrosomethyl-n-amylamine
('CID100025805', 4),N-Nitrosomethyl-n-amylamine
('CID100025805', 4),N-Nitrosomethyl-N-amylamine
('CID100025805', 4),N-Nitroso-N-methyl-n-amylamine
ldiff: defaultdict(<type 'list'>, {'CID100025805': [16, 18, 18, 21], 'CID100008060': [0, 21, 2, 2, 2]})
f1: [0, 21, 2, 2, 2]
f2: [16, 18, 18, 21]
c1: Counter({2: 3, 0: 1, 21: 1})
c2: Counter({18: 2, 16: 1, 21: 1})
The chosen was ... CID100008060