Abstract
OF the three urobilinoid pigments excreted by man (i-urobilin, d-urobilin and stercobilin), only i-urobilin has a structure established by degradation and synthesis1. The structure of i-urobilin is as shown in (I), except that the end rings, in common with all so-called hydroxypyrroles, are probably lactam in nature2. The other two pigments are formally derived from i-urobilin by dehydrogenation and tetrahydrogenation respectively3.
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GRAY, C., NICHOLSON, D. Structure of Stercobilin. Nature 179, 264–265 (1957). https://doi.org/10.1038/179264a0
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DOI: https://doi.org/10.1038/179264a0
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