('CID100174321', 1),Reaction product of silica-triethylphosphate-chromium (VI) trioxide
('CID100006535', 1),Triethylphosphate
ldiff: defaultdict(<type 'list'>, {'CID100174321': [50], 'CID100006535': [0]})
f1: [50]
f2: [0]
c1: Counter({50: 1})
c2: Counter({0: 1})
The chosen was  ... CID100006535