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  • Title: Trans-fused iridoid glycosides from Penstemon mucronatus.
    Author: Krull RE, Stermitz FR.
    Journal: Phytochemistry; 1998 Dec; 49(8):2413-5. PubMed ID: 9887533.
    Abstract:
    Two new trans-fused iridoid glycosides (5 alpha H)-6 alpha-8-epidihydrocornin and (5 alpha H)-6 alpha-8-hydroxy-8-epiloganin, were isolated from Penstemon mucronatus, along with cornin, penstemoside and three hastatosides. The trans-fused iridoids are only the second and third known among over 900 described cis-fused iridoid glycosides. Two pairs of iridoids, identical except for the stereochemistry at C-8, were found. Structures were determined by spectroscopic methods.
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