Murexide

Murexide
Names
	IUPAC name Ammonium 2,6-dioxo-5-[(2,4,6-trioxo-5-hexahydropyrimidinylidene)amino]-3H-pyrimidin-4-olate
	Other names Purpuric acid ammonium salt
Identifiers
CAS Number	3051-09-0 ; 6032-80-0 (hydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	17264 ;
ECHA InfoCard	100.019.334
EC Number	221-266-6;
PubChem CID	18275;
UNII	4W6L62S876 ; 221FEY2154 (hydrate) ;
CompTox Dashboard (EPA)	DTXSID40889371 ;
	InChI InChI=1S/C8H5N5O6.H3N/c14-3-1(4(15)11-7(18)10-3)9-2-5(16)12-8(19)13-6(2)17;/h(H2,10,11,14,15,18)(H3,12,13,16,17,19);1H3 Key: LJYRLGOJYKPILZ-UHFFFAOYSA-N ; InChI=1/C8H5N5O6.H3N/c14-3-1(4(15)11-7(18)10-3)9-2-5(16)12-8(19)13-6(2)17;/h(H2,10,11,14,15,18)(H3,12,13,16,17,19);1H3 Key: LJYRLGOJYKPILZ-UHFFFAOYAL;
	SMILES [O-]\C2=C(/N=C1\C(=O)NC(=O)NC1=O)C(=O)NC(=O)N2.[NH4+];
Properties
Chemical formula	C8H8N6O6
Molar mass	284.188 g·mol−1
Density	1.72 g/cm3 (hydrate of ammonium salt)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Murexide (NH₄C₈H₄N₅O₆, or C₈H₅N₅O₆·NH₃), also called ammonium purpurate or MX, is the ammonium salt of purpuric acid. It is a purple solid that is soluble in water. The compound was once used as an indicator reagent. Aqueous solutions are yellow at low pH, reddish-purple in weakly acidic solutions, and blue-purple in alkaline solutions.