Urobilin

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Urobilin

Identifiers
CAS number	[1856-98-0]
PubChem	6433298
MeSH	Urobilin
Properties
Molecular formula	C₃₃H₄₂N₄O₆
Molar mass	590.71
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

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Urobilin is a yellow linear tetrapyrrole, resulting from the breakdown of haem, a cyclic tetrapyrrole. Urobilin is generated in intestines from urobilinogen. It is absorbed into blood stream and excreted in urine, giving urine its characteristic yellow color.

It is a sensitive marker for early acute hepatitis.

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v • d • e Types of tetrapyrroles

Bilanes:	Bilirubin \| Biliverdin \| Urobilinogen \| Urobilin

Chlorophylls:	Protochlorophyllide \| Chlorophyllide

Corrinoids:	Cyanocobalamin

Phycobilins:	Phycoerythrobilin \| Phycocyanobilin \| Phycourobilin \| Phycoviolobilin

Porphyrins:	Uroporphyrinogen (I, III) \| Coproporphyrinogen (I, III) \| Protoporphyrinogen IX \| Protoporphyrin (IX) \| Zinc protoporphyrin

Major families of biochemicals Peptides \| Amino acids \| Nucleic acids \| Carbohydrates \| Nucleotide sugars \| Lipids \| Terpenes \| Carotenoids \| Tetrapyrroles \| Enzyme cofactors \| Steroids \| Flavonoids \| Alkaloids \| Polyketides \| Glycosides