('CID105459361', 5),CIS-TETRACOSENOYL SULFATIDE
('CID105459361', 5),C24:1 Sulfatide
('CID105459361', 5),sulfatide
('CID105459361', 5),Sulfatide (d18:1/24:1(15Z))
('CID105459361', 5),Bovine brain sulfatide, nervonic acid (24:1) substituent
('CID100447693', 5),sulfatide
('CID100447693', 5),SULFATIDE
('CID100447693', 5),C18 Sulfatide
('CID100447693', 5),sulfatide
('CID100447693', 5),Sulfatide (d18:1/18:0)
ldiff: defaultdict(<type 'list'>, {'CID100447693': [0, 0, 4, 0, 13], 'CID105459361': [18, 6, 0, 18, 47]})
f1: [18, 6, 0, 18, 47]
f2: [0, 0, 4, 0, 13]
c1: Counter({18: 2, 0: 1, 6: 1, 47: 1})
c2: Counter({0: 3, 4: 1, 13: 1})
The chosen was  ... CID100447693