(3aS,4S,6aR)-;1'N-Benzyl Biotin;1a€N-Benzyl Biotin;Biotin EP Impurity E;Biotin N1-Benzyl Impurity;5-[(3aR)-1( oder !3)-benzyl-2-oxo-(3ar,6ac)-hexahydro-thieno[3,4-d]imidazol-4t-yl]-valeric acid;5-[(3aS)-1( oder !3)-benzyl-2-oxo-(3ar,6ac)-hexahydro-thieno[3,4-d]imidazol-4t-yl]-valeric acid;5-[(3aR,6S,6aS)-3-benzyl-2-oxo-3a,4,6,6a-tetrahydro-1H-thieno[3,4-d]imidazol-6-yl]pentanoic acid