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I was trying to look up what the poison in Chinaberry is, however, with the exception of a couple related compounds was able to find no information on the poison. What chemical makes up the Chinaberry poison, and what is this chemical's concentration and LD50, if known?

Edit: The Chinaberry I am referring to is Melia azedarach

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The toxin is Meliatoxin, in a class of toxins called tetranortriterpenes.

I found this here. Bold emphasis mine.

https://wagwalking.com/condition/chinaberry-tree-poisoning

What is Chinaberry Poisoning? The chinaberry tree is a member of the mahogany family that is native to Australia, China, and India. These deciduous trees sprout delicate light purple flowers in the spring, which develop into yellow, berry-like fruits in the summer. They were transported to North America in the early 1800’s as an ornamental plant, but has escaped into the environment and is considered an invasive species in several southern states. It produces a potent insecticide which utilizes a tetranortriterpene neurotoxin known as meliatoxin. This insecticide is found throughout the plant’s bark, leaves, and flowers but is found in the highest concentrations in the ripe fruit. If you suspect that your pet has consumed any of this plant, contact your veterinarian immediately. The chinaberry tree, or Melia azedarach, is a deciduous tree that produces a potent insecticide which utilizes a neurotoxin that can prove detrimental to your pet if ingested. Symptoms of Chinaberry Poisoning in Dogs Symptoms of chinaberry tree poisoning occur most often from eating the ripe fruit, however, the bark, leaves, and flowers also contain smaller amounts of the toxic substances. Symptoms usually begin within just two to four hours from ingestion. Abdominal pain Blood in stool Colic Constipation Death Depression Diarrhea Excessive drooling Heart attack Hyperactivity Lack of coordination Loss of appetite Muscle rigidity Seizures Slowed heart rate Stupor Vomiting Weakness Types

The scientific name for the chinaberry tree is Melia azedarach, and it belongs in the mahogany family.

From another source http://www.sciencedirect.com/science/article/pii/0031942283830398

Toxic tetranortriterpenes of the fruit of Melia azedarach . .Peter >B.Oelrichs. Michael W.Hill. Peter J.Vallely. John K.MacLeod. .Tadeusz >F.Molinski Show more https://doi.org/10.1016/0031-9422(83)83039-8Get rights and content Abstract Four new tetranortriterpenes, meliatoxins A1, A2, B1 and B2 have been isolated and identified as toxic constituents of the fruit of Melia azedarach L. var. australasica. Toxicity and pathological results confirm that the meliatoxins are responsible for most but not all of the symptoms resulting from the ingestion of whole fruit.

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