Vincorine is a complex akuammiline alkaloid with a challenging tetracyclic core structure containing a strained seven-membered azepanyl ring and a pyrroloindoline motif. It has been a target for total synthesis due to its potential biological activity.
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Representative alkaloids containing a 1,2,3,4-tetrahydro-9a,4a-(iminoethano)-9H-carbazole ring system: Echitamine, Vincorine, Minfiensine.