dioxoanthracenecarboxylic acid
C.I. Natural Red 4
|Molar mass||492.38 g/mol|
|Melting point||120 °C (248 °F; 393 K) (decomposes)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Carminic acid (C22H20O13) is a red glucosidal hydroxyanthrapurin that occurs naturally in some scale insects, such as the cochineal, Armenian cochineal, and Polish cochineal. The insects produce the acid as a deterrent to predators. Carminic acid is the colouring agent in carmine. Synonyms are C.I. 75470 and C.I. Natural Red 4.
- Merck Index, 11th Edition, 1850.
- Allevi, P. et al. (1991). "The 1st Total Synthesis of Carminic Acid". Journal of the Chemical Society-Chemical Communications 18: 1319–1320.