('CID100069602', 2),N-Acetylhistamine
('CID100069602', 2),N-ACETYLHISTAMINE
('CID100530214', 2),N-acetylhistamine, Tms
('CID100530214', 2),N-Acetylhistamine, TMS
ldiff: defaultdict(<type 'list'>, {'CID100069602': [0, 0], 'CID100530214': [5, 5]})
f1: [0, 0]
f2: [5, 5]
c1: Counter({0: 2})
c2: Counter({5: 2})
The chosen was ... CID100069602