('CID102757113', 2),2-(4-Bromophenyl)ethylisocyanide
('CID102757113', 2),2-(4-bromphenyl)-ethylisocyanide
('CID102769492', 1),(S)-(-)-?(1-Naphthyl)-ethylisocyanide
ldiff: defaultdict(<type 'list'>, {'CID102769492': [22], 'CID102757113': [17, 17]})
f1: [17, 17]
f2: [22]
c1: Counter({17: 2})
c2: Counter({22: 1})
The chosen was ... CID102757113