Oxybiotin

(+)-Oxybiotin

(3aβ,6aβ)-2-Oxohexahydro-1H-furo[3,4-d]imidazole-4α-pentanoic acid

(3aS,6aβ)-Hexahydro-2-oxo-1H-furo[3,4-d]imidazole-4α-pentanoic acid