Figure 1

Naphthoquinones evaluated in this study. I) Lapachol (2-hydroxy-3-(3-methylbut-2-enyl)naphthoquinone); II) α-lapachone (2,2-dimethyl-2H-benzo [g]chromene-5,10-dione); III) β-lapachone (2,2-dimethyl-3,4-dihydro-2H-benzo [h]chromene-5,6-dione); IV) (±) 3-hydroxy-β-N-lapachone ((±)3-hydroxy-2,2-dimethyl-2,3,3a,9b-tetrahydronaphtho [1,2-d] furan-4,5-dione)