Abstract

The structure of bonellin, the physiologically active pigment of the marine echurian worm Bonellia viridis, has been established as (10a), a unique type of alkylated chlorin, by a combination of physical methods. The structure was confirmed by an X-ray crystallographic study on anhydrobonellin methyl ester (12b).Bonellin is accompanied in the organism by a series of mono-amino-acid conjugate derivatives of general structure (14a) in which valine, leucine, isoleucine, and alloisoleucine are the major amino-acid constituents.

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