Moronic acid

Yes, there is a moronic acid: “Moronic acid, a simple triterpenoid keto acid with antimicrobial activity isolated from Ozoroa mucronata,” M. Hostettmann-Kaldas and K. Nakanishi, Planta medica 37.12 (1979): 358-60. Unwhimsically, it is not unstructured. The structure looks more or less like this: (Thanks to investigator Deborah Blum for bringing this substance to our attention.) […]