2,3,5,7-Tetrahydroxy-1,4-naphthalenedione
2,3,5,7-Tetraahydroxy-1,4-naphthalenedione, also called 2,3,5,7-tetrahydroxynaphthoquinone or spinochrome B, is an organic compound with formula, formally derived from 1,4-naphthoquinone through the replacement of four hydrogen atoms by hydroxyl groups.
Spinochrome B occurs naturally as pigment in the shell and spines of sea urchins such as the Japanese dull red species aka-uni, the greenish-black murasaki-uni, and the brown bafun-uni. It is soluble in methanol and crystallizes as bright red needles that sublime above 200 °C.
The compound gives a greenish yellow solution when treated with sodium hydroxide, a green solution with ferric chloride, and a green precipitate with lead acetate. It forms a fourfold acetate ester, 4, that crystallizes from methanol as yellow needles that melt at 157 °C.
