Riccardin C is a macrocyclic bis(bibenzyl). It is a secondary metabolite isolated from the Siberian cowslip subspecies Primula veris subsp. macrocalyx,Riccardin C, a bisbibenzyl compound from Primula macrocalyx. Yu. S. Kosenkova, M. P. Polovinka, N. I. Komarova, D. V. Korchagina, N. Yu. Kurochkina, V. A. Cheremushkina and N. F. Salakhutdinov, Chemistry Of Natural Compounds, Volume 43, Number 6, pages 712-713, Seasonal Dynamics of Riccardin C Accumulation in Primula macrocalyx Bge. Yu. S. Kosenkova, M.P. Polovinka, N.I. Komarova, D.V. Korchagina, N. Yu. Kurochkina, V.A. Cheremushkina and N.F. Salakhutdinov, Chemistry for Sustainable Development, 2009, 17, pages 507-511 (article) in Reboulia hemisphaericaRiccardinC, a novel cyclic bibenzyl derivative from Reboulia hemisphaerica. Yoshinori Asakawa, Reiko Matsuda, Phytochemistry, Volume 21, Issue 8, 1982, Pages 2143–2144, and in the Chinese liverwort Plagiochasma intermedium.Antifungal macrocyclic bis(bibenzyls) from the Chinese liverwort Ptagiochasm intermedlum L. Chun-Feng Xie, Jian-Bo Qu, Xiu-Zhen Wu, Na Liu, Mei Ji and Hong-Xiang Lou, Natural Product Research: Formerly Natural Product Letters, 2010, Volume 24, Issue 6, pages 515-520,
In 2005, the compound was prepared by total synthesis together with the strained compound cavicularin.Kostiuk, S. L., Woodcock, T., Dudin, L. F., Howes, P. D. and Harrowven, D. C. (2011), Unified Syntheses of Cavicularin and Riccardin C: Addressing the Synthesis of an Arene Adopting a Boat Configuration. Chemistry - A European Journal, 17: 10906–10915.
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