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Structure of the naturally occurring prezizane‐type sesquiterpenes (+)‐prezizaene (1), (+)‐jinkohol II (2), (−)‐prezizanol (3), (+)‐agarozizanol B (4), and retrosynthetic access to the tricyclic prezizane skeleton I by bond cleavage from a strained tetracyclic precursor. The bond set for the precursor (new bonds in gray) requires to bring in carbon atoms C6, C7, and C13‐C15 by a tethered trisubstituted olefin (tether indicated as dashed line).
