Where to buy Polymyxin B Sulphate?

CAS No.: 1405-20-5
M.F.: C56H98N16O13. H2SO4
M.W.: 1301.56
DESCRIPTION: WHITE TO ALMOST WHITE POWDER,HYGROSCOPIC.
SOLUBILITY: FREELY SOLUBLE IN WATER;SLIGHTLY SOLUBLE IN ALCOHOL.
IDENTIFICATION
LIQUID CHROMATOGRAPHIC IDENTIFICATION TEST
A REDDISH VIOLET COLOR IS PRODUCED
TEST FOR SULFATE
PH(2%): 5.0~7.0
PH(0.5%): 5.0~7.5
SPECIFIC ROTATION: -78°-  -90°
LOSS ON DRYING: NOT MORE THAN 7.0%
PHENYLALANINE: 9.0%~12.0%
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