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C43H51O26N Yellow pigment found in normal urine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a dark yellow pigment in the urine; a compound formed by the biliary pigment urobilin and unknown peptides. Urochrome gives the urine its normal color. Between 0.2 and 0.9 grams of urochrome are excreted daily under normal dietary and working conditions.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Some of the bilirubin is reabsorbed back into the body through the bowel wall - eventually appearing in the urine as a substance called urobilinogen (although the typical yellow or orange colour of urine is in fact due a different pigment called urochrome).
The yellow color is due to the presence of urochrome, a product of endogenous metabolism.
Using a combination of specially developed enzymes to completely remediate the acid crystals and remove the urea and urochrome. Urine-Off attacks only the offending substances and leaves a pleasant citrus fragrance without harming fabric, floorcoverings, or other hard or soft surfaces.