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Interception of the diterpene cyclisation by CaCS with 14,15‐dihydro‐GGPP. A) Cyclisation mechanism to 4 and its MgSO4 dependent degradation, B) derivatisation of 4 with N‐bromosuccinimide (NBS). Carbon numberings deviate from that for 5 a in the literature and indicate the origin of each carbon from 14,15‐dihydro‐GGPP by the same number.
