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of tryptamine derivatives. They are produced by methylation of indole nucleus at position 3 and the subsequent nucleophilic addition at the carbon atom in positions 2 with the closure of the ethylamino group into a ring. A typical representative of this group is physostigmine, which was isolated by Jobst and Hesse in 1864.

Isoprenoid indole alkaloids

Isoprenoid indole alkaloids include residues of tryptophan

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