Sesquiterpenoids of Riccardia and Pallavicinia species

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Abstract Riccardia species (Metzgeriales) contain various types of sesquiterpenes. R. jackii produces ent -selinane-, ent -aromadendrane-and ent -bicyclogermacrane-type sesquiterpenes together with ( R )-cuparene and α-barbatene. Aneura pinguis (= Riccardia pinguis ) is chemically quite different from R. multifida and R. jackii . The former produces a large amount of pinguisone. R. multifida contains 6-(3-methyl-2-butenyl)-indole and (+)-β-elemene as the major components. Pallavicinia longispina (Dilaenaceae; Metzgeriales) produces mainly spathulenol. The chiral properties of the sesquiterpenes isolated from R. jackii are quite similar to those of red algae, Laurencia species.

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