('CID100003860', 2),l-d-(a-aminoadipoyl)-l-cysteinyl-d-valine
('CID100003860', 2),L-D-(A-AMINOADIPOYL)-L-CYSTEINYL-D-VALINE
('CID142627190', 1),l-d-(a-aminoadipoyl)-l-cysteinyl-d-valine
ldiff: defaultdict(<type 'list'>, {'CID142627190': [0], 'CID100003860': [0, 0]})
f1: [0, 0]
f2: [0]
c1: Counter({0: 2})
c2: Counter({0: 1})
The chosen was ... CID100003860