Biotin-x, free acid can be used for biosynthesis of biotinylated oligosaccharides and also commonly used as derivatives of hydroxysuccinyl amide.
Biotin-X, free acid is white solid, and with molecular weight is 357.47. Abbkine supplies below price/size for your choice: $42/20 mg, $315/200 mg.
The Biotin-X, free acid has below features: can be easily converted to the mixed anhydride form, which is more reactive than the succinimidyl ester and thus can be used to react with aromatic amines or sterically hindered amines.
More Tracer reagent at https://www.abbkine.com/product-category/biochemical/tracer-reagent/.
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