('CID100008427', 4),Propanoicacid, 2-(2,4-dichlorophenoxy)-, sodium salt (9CI)
('CID100008427', 4),Propanoicacid, 2-(2,4-dichlorophenoxy)-, potassium salt, (R)- (9CI)
('CID100008427', 4),Propanoicacid, 2-(2,4-dichlorophenoxy)-, potassium salt (9CI)
('CID100008427', 4),Propanoicacid, 2-(2,4-dichlorophenoxy)-, sodium salt, (2R)- (9CI)
('CID100007153', 3),Propanoicacid, 2-(4-chloro-2-methylphenoxy)-, ammonium salt (9CI)
('CID100007153', 3),Propanoicacid, 2-(4-chloro-2-methylphenoxy)-, sodium salt (9CI)
('CID100007153', 3),Propanoicacid, 2-(4-chloro-2-methylphenoxy)-, potassium salt (9CI)
ldiff: defaultdict(<type 'list'>, {'CID100008427': [45, 54, 48, 52], 'CID100007153': [52, 50, 53]})
f1: [45, 54, 48, 52]
f2: [52, 50, 53]
c1: Counter({48: 1, 52: 1, 45: 1, 54: 1})
c2: Counter({50: 1, 52: 1, 53: 1})
The chosen was ... CID100008427