Abstract
Pterobilin 1 (biliverdin IXγ), a butterfly bile pigment, is photocyclized into phorcabilin 2 and sarpedobilin 3 by irradiation in visible light. Selective irradiations have now been performed at the absorption maxima of pterobilin 1. The 650-nm radiations are responsible for the observed photocyclizations while the 375-nm radiations lead to decomposition products. These results are discussed in connection with a hypothesis concerning the biological role of pterobilin in butterfly larvae.
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