Although it may not be known at this time whether the compound proper iridodial is actually present in natural plant species or not, the use of analogous ion iridodial cation is mentioned in several papers on iridoid biosyntheses in plant species. [2][3]
^Geu-Flores, Fernando; Sherden, Nathaniel H.; Courdavault, Vincent; Burlat, Vincent; Glenn, Weslee S.; Wu, Cen; Nims, Ezekiel; Cui, Yuehua; O’Connor, Sarah E. (2012). "An alternative route to cyclic terpenes by reductive cyclization in iridoid biosynthesis". Nature. 492 (7427): 138–42. Bibcode:2012Natur.492..138G. doi:10.1038/nature11692. PMID23172143. S2CID4431685.
^Uesato (1984). "Biosynthetic pathway of iridoid glucosides in Gardenia jasminoides f. grandiflora cell suspension cultures after iridodial cation formation". Tetrahedron Letters. 25 (5): 573–576. doi:10.1016/S0040-4039(00)99941-6.
^Sampaio-Santos (2001). "Biosynthesis significance of iridoids in chemosystematics". Journal of the Brazilian Chemical Society (12): 144–153.