21. Attempts towards elucidating the structure of the molecule used the lactone ring as a starting point. 22. Each dye molecule in " Zubbles " is a structure known as a lactone ring. 23. At a threshold concentration, LasR binds N-( 3-oxododecanoyl )-homoserine lactone . 24. The plant is somewhat toxic to mammals and insects due to the presence of the lactone tenulin. 25. "' Cynaropicrin "'is a sesquiterpene lactone exhibiting a range of diverse bioactivities. 26. In one industrial synthesis of oxandrolone the key lactone -forming step is an organic reduction-esterification. 27. Artemisinin is a sesquiterpene lactone with an endoperoxide bridge and has been produced semisynthetically as an antimalarial drug. 28. However, subjecting the lactone ring to air, water or pressure, causes the ring to open. 29. Andrographolide is the major constituent extracted from the leaves of the plant and is a bicyclic diterpenoid lactone . 30. Rhizoxin is a 16-membered lactone ring connected to an oxazole ring by a long unsaturated chain.
