2-Methyl-1 4-naphthoquinone(Menadione)
Amfani: β-naphthoquinone, wanda kuma aka sani da bitamin K3 mai soluble, ana yawan yin shi zuwa gishiri daban-daban na β-naphthoquinone saboda rashin kwanciyar hankali. Babban samfurin shine MSB (sodium bisulfite naphthoquinone); MNB (Niacinamide Methylnaphthoquinone bisulfite). Vitamin K3 ne na gargajiya hemostatic wakili a asibiti magani, kuma ana amfani da su bi da dysentery, cholecystitis, da dai sauransu, musamman a cikin lura da ciwon daji, tare da faffadan bege na aikace-aikace. A halin yanzu, babban amfaninsa shine azaman ƙari na abinci, fungicides, da matsakaicin magunguna. Daban-daban abubuwan da aka yi daga β-naphthoquinone ana amfani da su azaman ƙwayoyin kwari da masu hana mold. A matsayin sabon nau'in mai kula da ci gaban shuka a aikin gona, ya ja hankalin jama'a.
