C4H4N2O2 M.W. 112.09
DESCRIPTION ............... white crystalline powder
ASSAY(UV) ................. min 99%
LOSS ON DRYING ............ max 0.5%
SULPHATED ASH ............. max 0.1%
HEAVY METALS(Pb) .......... max 0.001%
A250nm/A260nm ............. 0.81-0.85
A280nm/A260nm ............. 0.18-0.22
A290nm/A260nm ............. max 0.02