Spithioneines A and B, Two New Bohemamine Derivatives Possessing Ergothioneine Moiety from a Marine-Derived Streptomyces spinoverrucosus

Spithioneines A and B, Two New Bohemamine Derivatives Possessing Ergothioneine Moiety from a Marine-Derived <i>Streptomyces spinoverrucosus</i> 1,3-Oxazin-6-one Derivatives and Bohemamine-Type Pyrrolizidine Alkaloids from a Marine-Derived <i>Streptomyces spinoverrucosus</i> 1,3-Oxazin-6-one Derivatives and Bohemamine-Type Pyrrolizidine Alkaloids from a Marine-Derived <i>Streptomyces spinoverrucosus</i> Bohemamines from a Marine-Derived <i>Streptomyces</i> sp. Bohemamines from a Marine-Derived <i>Streptomyces</i> sp. Discovery of New Bohemamines and Synthesis of <scp>Methylene‐Bridged</scp> Chimeric Derivatives through Natural Product Chimera Strategy Discovery, Characterization, and Analogue Synthesis of Bohemamine Dimers Generated by Non‐enzymatic Biosynthesis Nitrosporeusines A and B, Unprecedented Thioester-Bearing Alkaloids from the Arctic <i>Streptomyces nitrosporeus</i> Nitrosporeusines A and B, Unprecedented Thioester-Bearing Alkaloids from the Arctic Streptomyces nitrosporeus Ergothioneine, Ovothiol A, and Selenoneine—Histidine-Derived, Biologically Significant, Trace Global Alkaloids