(.+-.)-Dethiobiotin 4-Imidazolidinehexanoic acid, 5-methyl-2-oxo-, (.+-.)- 4-Imidazolidinehexanoic acid, 5-methyl-2-oxo-, cis-(.+-.)- 636-20-4 NSC203773 dl-Desthiobiotin dl-Dethiobiotin dl-Dithiobiotin