Macrocyclic Spermine Alkaloids fromVerbascum: Isolation, Structure Elucidation, and Syntheses of the (E/Z)-Isomeric Pairs (S)-Verbasikrine/(S)-Isoverbasikrine and (S)-Verbamekrine/(S)-Isoverbamekrine

Macrocyclic Spermine Alkaloids fromVerbascum: Isolation, Structure Elucidation, and Syntheses of the (E/Z)-Isomeric Pairs (S)-Verbasikrine/(S)-Isoverbasikrine and (S)-Verbamekrine/(S)-Isoverbamekrine Macrocyclic Spermine Alkaloids fromVerbascum: The (E/Z)-Isomeric Pairs (−)-(S)-Verbasitrine/(−)-(S)-Isoverbasitrine and (+)-(S)-Verbametrine/(+)-(S)-Isoverbametrine: Isolation, Structure Elucidation, and Synthesis Verbacine and verballocine, novel macrocyclic spermine alkaloids from Verbascum pseudonobile Stoj. et Stef. (Scrophulariaceae) Verbascenin, ein macrocyclisches Spermin‐Alkaloid aus verbascum 184. Mitteilung über organische Naturstoffe Verbaskine, a macrocyclic spermine alkaloid of a novel type from Verbascum pseudorobile Stoj. et Stef. (Scrophulariaceae) Separation of E-Z isomeric macrocyclic spermine alkakoids of Verbascum pseudonobile and Verbascum phoeniceum and of their derivatives using thin-layer chromatography Verballoscenine, the Z isomer of verbascenine from Verbascum phoeniceum Five novel macrocyclic spermine alkaloids from incarvillea sinensis Prelandrine, the Key-Step Intermediate in the Biosynthesis of the Macrocyclic Spermine Alkaloid Aphelandrine Veramine, a novel type of veratrum alkaloid with a 17β-methyl-18-nor-17-iso-spirosolane skeleton