Abstract
Anthosamines A and B ( 1 and 2), new pipecolate derivatives have been isolated as metamorphosis-inducers of ascidian Halocynthia roretzi larvae from a marine sponge Anthosigmella aff. raromicrosclera; along with a new diketopiperazine 3, cyclo-(L-Arg-dehydrotyrosine). Their structures were elucidated on the basis of spectral data. Reversible isomerization between amine and iminium ion forms were observed for 1 and 2; iminium ion forms ( 1b and 2b) predominate in protic solvent, amine forms ( 1a and 2a) in aprotic solvent.
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