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CAS number 521-61-9 YesY
PubChem 10639
ChemSpider 10193 N
KEGG C17045 N
Jmol-3D images Image 1
Molecular formula C16H12O5
Molar mass 284.26348 g/mol
Appearance Orange/yellow
Related compounds
Related compounds Emodin
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Parietin is the predominant cortical pigment of lichens in the genus Caloplaca, a secondary product of the lichen Xanthoria parietina, and a pigment found in the roots of Curled Dock (Rumex crispus). It has an orangy-yellow color and absorbs blue light.

It reacts with KOH to form a deep, reddish-magenta compound.

It has also shown anti-fungal activity against barley powdery mildew and cucumber powdery mildew, more efficiently in the latter case than treatments with fenarimol and polyoxin B.


  • Caloplaca coralloides chemistry
  • Choi, Gyung Ja; Seon-Woo Lee, Kyoung Soo Jang, Jin-Seog Kim, Kwang Yun Cho and Jin-Cheol Kim (December 2004). "Effects of chrysophanol, parietin, and nepodin of Rumex crispus on barley and cucumber powdery mildews". Crop Protection 23 (12): 1215–1221. doi:10.1016/j.cropro.2004.05.005. 
  • Edwards, Howell G. M.; Emma M. Newton; David D. Wynn-Williams; Steven R. Coombes (2003-03-12). "Molecular spectroscopic studies of lichen substances 1: parietin and emodin". Journal of Molecular Structure 648 (1–2): 49–59. doi:10.1016/S0022-2860(02)00384-8. 
  • Solhaug, Knut A.; Yngvar Gauslaa (November 1996). "Parietin, a photoprotective secondary product of the lichen Xanthoria parietina". Oecologia 108 (3): 412–418. doi:10.1007/BF00333715.