4-Amino-2-methyl-1-naphthol

4-Amino-2-methyl-1-naphthol
Names
	Preferred IUPAC name 4-Amino-2-methylnaphthalen-1-ol
Identifiers
CAS Number	83-70-5 ; (HCl): 130-24-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	6497;
EC Number	204-983-9;
PubChem CID	6754;
UNII	KKP97T7O0X ; (HCl): DJ4D3O924J ;
CompTox Dashboard (EPA)	DTXSID3075042;
	InChI InChI=1S/C11H11NO/c1-7-6-10(12)8-4-2-3-5-9(8)11(7)13/h2-6,13H,12H2,1H3 Key: UGQFCTZXVAPVCS-UHFFFAOYSA-N;
	SMILES CC1=C(C2=CC=CC=C2C(=C1)N)O;
Properties
Chemical formula	C11H11NO
Molar mass	173.215 g·mol−1
Appearance	HCl: white crystalline powder
Solubility	HCl: soluble in water, poorly soluble in ethanol, insoluble in diethyl ether
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

4-Amino-2-methyl-1-naphthol is a menadione analog. Its water-soluble hydrochloride (HCl) salt is often called vitamin K₅. The HCl salt has been used as a medicine for vitamin K deficiency under tradenames such as Synkamin, which was sold by Parke-Davis, but has since been discontinued.

Vitamin K function of the compound was first noted in 1940.

Oral lethal dose for the HCl salt in rats is 0.7 g/kg.