Abstract
The cover picture displays a class of novel isosteroidal alkaloids isolated from Fritillaria verticillata Willd. Among them, compounds 1—3 were unprecedented cis‐fused D/E (13α,17α) cevanine alkaloids; compound 6 was one rarely cis‐fused E/F (22α) cevanine alkaloid. Their structures were determined by the solid data acquired from diverse methods. In addition, some proton and carbon signals α to nitrogen in 6 and 7 are unobservable due to the 14N nuclear quadrupolar relaxation, based on the NMR experiments in different solvents, calculated NMR method and X‐ray technology, their structures were determined. The NMR characteristics of cevanine alkaloids to distinguish orientation of long‐pair on nitrogen atom with β‐hydroxyl at C‐20 were also concluded. More details are discussed in the article by Pei et al. on page 1945–1956.image
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