Letter | Published:

Dextrorotatory Urobilin-IXα and Racemic d-Urobilin


OF the three hitherto known bilene-b pigments only l-stercobilin and d-urobilin are optically active; i-urobilin has never been obtained in an optically active form. We now report the isolation of a dextrorotatory urobilin IXα and a racemic form of d-urobilin.

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    Gray, C. H., Nicholson, D. C., and Nicolaus, R. A., Nature, 181, 183 (1958).

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