('CID100000857', 11),D-LEUCINE
('CID100000857', 11),D-Leucin
('CID100000857', 11),D-leucinate
('CID100000857', 11),D-LEUCINE
('CID100000857', 11),D-leucine anion
('CID100000857', 11),D-leucine cation
('CID100000857', 11),D-leucine cation
('CID100000857', 11),D-leucinate
('CID100000857', 11),D-leucine anion
('CID100000857', 11),D-Leucine-2-d1
('CID100000857', 11),D-Leucine-1-13C
('CID100065105', 6),D-Leucine Methyl Ester HCl
('CID100065105', 6),D-Leucine Methyl Ester Hydrochloride
('CID100065105', 6),D-Leucine, methyl ester
('CID100065105', 6),D-Leucine Methyl Ester Hydrochloride
('CID100065105', 6),methyl d-leucinate
('CID100065105', 6),D-Leucine Methyl Ester Hydrochloride
ldiff: defaultdict(<type 'list'>, {'CID100065105': [17, 27, 14, 27, 9, 27], 'CID100000857': [0, -1, 2, 0, 6, 7, 7, 2, 6, 5, 6]})
f1: [0, -1, 2, 0, 6, 7, 7, 2, 6, 5, 6]
f2: [17, 27, 14, 27, 9, 27]
c1: Counter({6: 3, 0: 2, 2: 2, 7: 2, 5: 1, -1: 1})
c2: Counter({27: 3, 17: 1, 14: 1, 9: 1})
The chosen was ... CID100000857