Sigma-Aldrich
Q 53 2-ACETOXY-3-ISOBUTYL-1,4-NAPHTHOQUINONE
Q131 2,3-DIPHENOXY-1,4-NAPHTHOQUINONE
Q191 2-(BIS(ETHOXYCARBONYL)METHYL)-3-CHLORO-1,4-NAPHTHOQUINONE
Quartz-fused