('CID100168399', 6),8-Norleucine-ceruletide(4-10)
('CID100168399', 6),Ceruletide
('CID100168399', 6),Ceruletide(4-10), 8-norleucine-
('CID100168399', 6),Ceruletide (USAN/INN)
('CID100168399', 6),Ceruletide [USAN:INN:BAN]
('CID100168399', 6),Nle(8)-ceruletide(4-10)
('CID116129675', 5),Ceruletid
('CID116129675', 5),Ceruletide
('CID116129675', 5),Ceruletide (USAN/INN)
('CID116129675', 5),Ceruletide [USAN:INN:BAN]
('CID116129675', 5),Ceruletide
ldiff: defaultdict(<type 'list'>, {'CID116129675': [-1, 0, 11, 15, 0], 'CID100168399': [19, 0, 21, 11, 15, 13]})
f1: [19, 0, 21, 11, 15, 13]
f2: [-1, 0, 11, 15, 0]
c1: Counter({0: 1, 11: 1, 13: 1, 15: 1, 19: 1, 21: 1})
c2: Counter({0: 2, 11: 1, -1: 1, 15: 1})
The chosen was  ... CID116129675