Melacacidin is a chemical compound related to

leucoanthocyanidin Leucoanthocyanidin (flavan-3,4-diols) are colorless chemical compounds related to anthocyanidins and anthocyanins. Leucoanthocyanins can be found in '' Anadenanthera peregrina'' and in several species of '' Nepenthes'' including '' N. burbidg ...

s. It can be found in ''

Acacia crassicarpa ''Acacia crassicarpa'' (northern wattle, thick-podded salwood, brown salwood, Papua New Guinea red wattle, red wattle; syn. ''Racosperma crassicarpum'' (A.Cunn. ex Benth.) Pedley.) is a tree native to Australia (Queensland), West Papua (Indones ...

''. Melacacidin is a compound that can provoke contact allergy to Australian blackwood ''

Acacia melanoxylon ''Acacia melanoxylon'', commonly known as the Australian blackwood, is an ''Acacia'' species native in South eastern Australia. The species is also known as Blackwood, hickory, mudgerabah, Tasmanian blackwood, or blackwood acacia. The tree belon ...

''.Contact allergy to Australian blackwood (Acacia melanoxylon R.Br.): isolation and identification of new hydroxyflavan sensitizers B. M. Hausen, G. Bruhn, D. A. Tilsley, 2006
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References

Leucoanthocyanidins Catechols Enediols {{Aromatic-stub