Menadione

Menadione
Properties
Chemical formula	C11H8O2
Molar mass	172.183 g·mol−1
Appearance	Bright yellow crystals
Density	1.225g/cm3
Melting point	105 to 107 °C (221 to 225 °F; 378 to 380 K)
Solubility in water	Water: 160 mg/L (at 30 °C). Slightly soluble in ethanol, acetic acid, and ligroin. Soluble in ethyl ether, benzene, chloroform, and sulfuric acid.
Pharmacology
ATC code	B02BA02 (WHO)
Pregnancy; category	Contraindicated (India);
Routes of; administration	Oral; Intravenous; Intramuscular;
Legal status	Generally Rx or withdrawn for human use; approved in animal feed;
Hazards
Flash point	113.8 °C (236.8 °F; 386.9 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	0.5 g/kg (oral, mouse)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Menadione
Clinical data
Other names	Menaphthone; Vitamin K3; β-Methyl-1,4-naphthoquinone; 2-Methyl-1,4-naphthodione; 2-Methyl-1,4-naphthoquinone
ATC code	B02BA02 (WHO) ;
Identifiers
	IUPAC name 2-Methylnaphthalene-1,4-dione (preferred);
CAS Number	58-27-5 ;
PubChem CID	4055;
DrugBank	DB00170 ;
ChemSpider	3915 ;
UNII	723JX6CXY5;
KEGG	D02335 ;
ChEBI	CHEBI:28869 ;
CompTox Dashboard (EPA)	DTXSID4021715 ;
ECHA InfoCard	100.000.338
Chemical and physical data
Formula	C11H8O2
Molar mass	172.183 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C\2c1c(cccc1)C(=O)/C(=C/2)C;
	InChI InChI=1S/C11H8O2/c1-7-6-10(12)8-4-2-3-5-9(8)11(7)13/h2-6H,1H3 ; Key:MJVAVZPDRWSRRC-UHFFFAOYSA-N ;
	(what is this?) (verify)

Menadione is a natural organic compound with the formula C₆H₄(CO)₂C₂H(CH₃). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is sometimes called vitamin K₃. Use is allowed as a nutritional supplement in animal feed because of its vitamin K activity.