('CID106435889', 2),Diethylenetriamine ethylenedichloride oleylamine polymer
('CID106435889', 2),Diethylenetriamine, ethylenedichloride, oleylamine polymer
('CID100171099', 1),Ethylenedichloride-ammonia polymer, methylchloride quaternary
ldiff: defaultdict(<type 'list'>, {'CID100171099': [43], 'CID106435889': [38, 40]})
f1: [38, 40]
f2: [43]
c1: Counter({40: 1, 38: 1})
c2: Counter({43: 1})
The chosen was ... CID106435889