Penispirozines A–H, Three Classes of Dioxopiperazine Alkaloids with Spirocyclic Skeletons Isolated from the Mangrove-Derived Penicillium janthinellum

Eight new dioxopiperazine alkaloids, penispirozines A–H (1–8), were discovered from the mangrove-derived fungus Penicillium janthinellum HDN13-309. Their structures were elucidated by spectroscopic...