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Summary of previously proposed biosynthetic mechanisms for hapalindole, fischerindole, ambiguine and welwitindolinone formation. The cis-indole isonitrile core (1) is highlighted in blue and the geranyl monoterpene unit (GPP) is highlighted in red. Magenta arrows highlight the mechanism hypothesized by Moore et. al.11 Green arrows highlight the mechanism hypothesized by Carmeli et. al.7 Orange arrows highlight the mechanism hypothesized by Baran et. al.38
