('CID100041554', 5),(E)-2-amino-4-(2-aminoethoxy)-3-butenoic acid
('CID100041554', 5),(E,2S)-2-amino-4-(2-aminoethoxy)-3-butenoic acid
('CID100041554', 5),(S-(E))-2-Amino-4-(2-aminoethoxy)-3-butenoic acid
('CID100041554', 5),(E,2R)-2-amino-4-(2-aminoethoxy)-3-butenoic acid
('CID100041554', 5),(S-(E))-2-Amino-4-(2-aminoethoxy)-3-butenoic acid
('CID100002766', 4),(E)-4-amino-2,3-ditritio-2-butenoic acid
('CID100002766', 4),E-4-Amino-2-butenoic acid
('CID100002766', 4),(E)-4-Amino-2-butenoic acid
('CID100002766', 4),(E)-4-Amino-2-butenoic acid
ldiff: defaultdict(<type 'list'>, {'CID100002766': [13, -2, 0, 0], 'CID100041554': [18, 21, 22, 21, 22]})
f1: [18, 21, 22, 21, 22]
f2: [13, -2, 0, 0]
c1: Counter({21: 2, 22: 2, 18: 1})
c2: Counter({0: 2, 13: 1, -2: 1})
The chosen was  ... CID100002766