CHARACTERISTICS

Yellow, odorless or practically odorless, crystalline powder

SOLUBILITY

Soluble in hot alcohol and in dilute alkali solutions; slightly soluble in 2N sulfuric acid; insoluble in water, in acetone, and in ether.

IDENTIFICATION A :IR

The infrared absorption spectrum is concordant with that of reference standard.

IDENTIFICATION B :HPLC

The retention time of the major peak of the Sample solution corresponds to that of the Standard solution, as obtained in the Assay.

WATER

≤12.0%

PHOSPHOROUS

≤100ppm

RESIDUE ON IGNITION

≤0.1%

PYRIDINE

≤200ppm

IMPURITY A(HYPOXANTHINE)

≤0.15%

DISULFIDE

≤0.15%

UNSPECIFIED IMPURITY

≤0.10%

TOTAL IMPURITIES

≤0.5%

ASSAY(HPLC)

97.0%-102.0%(C5H4N4S, Calculated on the anhydrous basis)