D-Cycloserine USP


(R)-4-Amino-3-isoxazolidone, 4-Amino-3-isoxazolidinone, D-(+)-Cycloserine, (+)-4-Amino-3-isoxazolidinone

Technical Data

CAS Number: 68-41-7
Molecular Formula: C3H6N2O2
Molecular Weight: 102.09
Beilstein Registry Number: 80798
EC Number: 200-688-4

FabriChem Specifications

DescriptionWhite to pale
yellowish crystalline powder
IdentificationA blue color gradually develops
pH5.5 – 6.5
Loss on DryingNot more than 1.0%
Specific Optical Rotation+108.0° - +114.0°
CrystallinityMeets the requirements
Residue on IgnitionNot more than 0.5%
Assay (HPLC)Not less than 900 μg/mg
Condensation products at 285 nmNot more than 0.80
Residual Solvent:
EthanolNot more than 5,000 ppm
MethanolNot more than 3,000 ppm

Molecular Structure



D-Cycloserine USP inhibits cell wall biosynthesis (D-Ala peptide bond formation), and also prevents conversion of D-Ala to L-Ala.