('CID100000516', 6),R-Mevalonic acid-5-Pyrophosphate
('CID100000516', 6),R-Mevalonic acid-5-Pyrophosphic acid
('CID100000516', 6),(R)-Mevalonic acid 5-diphosphate
('CID100000516', 6),(R)-Mevalonic acid-5-diphosphate
('CID100000516', 6),(R)-Mevalonic acid-5-diphosphate
('CID100000516', 6),(R)-Mevalonic acid-5-pyrophosphate
('CID100000449', 5),(R)-mevalonic acid
('CID100000449', 5),(R)-Mevalonic acid
('CID100000449', 5),(R)-mevalonate
('CID100000449', 5),(R)-mevalonate
('CID100000449', 5),(R)-MEVALONATE
ldiff: defaultdict(<type 'list'>, {'CID100000449': [4, 4, 0, 0, 0], 'CID100000516': [18, 22, 18, 18, 18, 20]})
f1: [18, 22, 18, 18, 18, 20]
f2: [4, 4, 0, 0, 0]
c1: Counter({18: 4, 20: 1, 22: 1})
c2: Counter({0: 3, 4: 2})
The chosen was  ... CID100000449