lawsone [ 2-hydroxy-1,4-naphthoquinone,2-hydroxynaphthoquinone,NQ-2-OH,henna dye,lawsone, sodium salt,lawsonin,sodium lawsonate ] a molluscacide from leaves of Lawsonia inermis L. topical sunscreening agent; structure; powdered leaves of Lawsonia inermis(Lythraceae) used as brown hair dye