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Preferred IUPAC name
2,3,5,7-Tetrahydroxynaphthalene-1,4-dione | |
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Chemical formula
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C10H6O6 |
Molar mass | 222.15 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Spinochrome B (2,3,5,7-tetrahydroxynaphthoquinone) is an organic compound with formula C
10H
6O
4, formally derived from 1,4-naphthoquinone through the replacement of four hydrogen atoms by hydroxyl (OH) groups.
Spinochrome B occurs naturally as pigment in the shell and spines of sea urchins such as the Japanese dull red species aka-uni (Pseudocentrotus depressus), the greenish-black murasaki-uni (Heliocidaris crassispina), and the brown bafun-uni (Strongylocentrotus pulcherrimus).[1][2] It is soluble in methanol and crystallizes as bright red needles that sublime above 200 °C.[2]
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, C
10H
2O
2(CH
3COO)4, that crystallizes from methanol as yellow needles that melt at 157 °C.[2]