Xanthobilirubic acid

Interesting tautomeric possibilities exist in the xanthobilirubic acid series (cf. reference 57) which can be illustrated by the equilibrium 62 63, More complex examples of the same type are found among the linear tetrapyrrole pigments— the bilenes, bilidienes, and bili-trienes—and have been discussed by Stevens. Relatively little evidence is available concerning the fine structure of these compounds, although the formation of complexes has been advanced as evidence for the 0X0 structure in some cases. ... 

J. Jacobsen and R, Broderson, Albumin-bilirubin binding mechanism Kinetic and spectroscopic studies of binding of bilirubin and xanthobilirubic acid to human serum albumin, J. Biol. Chem., 258 6319 (1983). 

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See also in sourсe #XX -- [ , ]

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