Azure A is an organic compound with the chemical formula C14H14ClN3S. It is a light blue to dark blue dye. It is used as a screening test for mucopolysaccharides. It can also be used to stain lysosome in blood smears, and is often used in Giemsa stain.

Azure A
Names
IUPAC name
N',N'-dimethylphenothiazin-5-ium-3,7-diamine chloride
Other names
asym-Dimethylthionine Chloride; Methylene Azure A
Identifiers
3D model (JSmol)
3922287
ChEBI
ChemSpider
ECHA InfoCard 100.007.738 Edit this at Wikidata
UNII
  • InChI=1S/C14H14N3S.ClH/c1-17(2)10-4-6-12-14(8-10)18-13-7-9(15)3-5-11(13)16-12;/h3-8H,15H2,1-2H3;1H/q+1;/p-1 checkY
    Key: PGWTYMLATMNCCZ-UHFFFAOYSA-M checkY
  • [Cl-].CN(C)c1cc2[s+]c3cc(N)ccc3nc2cc1
Properties
C14H14ClN3S
Appearance green to dark brown powder
Density 1.776
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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