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. 2021 Jul 30;2(3):276–288. doi: 10.1007/s42994-021-00058-x

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© The Author(s) 2021, corrected publication 2021

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Fig. 2 — Proposed cyclization mechanisms for the formation of amorpha-4,11-diene by ADS. Reactions starting from the initial 1,6-ring closure of FDP and the generation of bisabolene-type by-products are highlighted in blue. Steps proceeding through the initial 1,10-ring closure and corresponding by-products are marked in red