Melting point 210℃～217℃
(abs. max. 280nm,ε=13,000±2%, PH1)：
A250/A260 0.41～0.49
A280/A260 2.05～2.15
Specific rotation [a]20/D +29 ～ +33 °(C=9, W/V in NaOH)
Loss on drying ≤0.5%
Residue On Ignition ≤0.1%
Heavy Metals(as pb)： ≤10ppm
Transmittance ≥98.0%(430nm, C=1, W/V, in H2O)
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