Elansolid A3 is a quinone methide from the bacterium Chitinophaga sancti that displays antibiotic activity.[27] Antibacterial quinone methides, 20-epi-isoiguesterinol, 6-oxoisoiguesterin, isoiguesterin and isoiguesterinol were found in Salacia madagascariensis.[28] Quinone methides tingenone and netzahualcoyonol were isolated from Salacia petenensis.[29] Nortriterpenoid quinone methide amazoquinone and (7S, 8S)-7-hydroxy-7,8-dihydro-tingenone were isolated from Maytenus amazonica.[30] An antimicrobial quinone methide, 15 alpha-hydroxypristimerin, was isolated from a South American medicinal plant, Maytenus scutioides.[31]