Indigo - phytochemistry

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chemical synthesis
industrial synthesis
Now just a bit of chemistry about how the compounds in plants are converted into indigo ...
indoxyl In Indigofera species, the precursor of indigo is indican (left), indoxyl-β-D-glucopyranoside, 

while in woad it is mainly isatan A (right)
Isatan A
Oberthür C, Schneider B, Graf H, Hamburger M, The Elusive Indigo Precursors in Woad (Isatis tinctoria L.) - Identification of the Major Indigo Precursor, Isatan A, and a Structure Revision of Isatan B, Chemistry & Biodiversity, 2004, 1(1), 174 - 182

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