Urine contains several different molecules (and is mostly made up of water), however, diregarding water urine mostly contains urea.
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Urea is a molecule commonly found in urine. It is a waste product formed from the breakdown of proteins in the liver and is excreted by the kidneys in urine to help rid the body of nitrogenous waste.
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The sugar molecule found in DNA nucleotides is called deoxyribose.
The two main substances found in urine are water and waste products, such as urea, creatinine, and uric acid.
If you are talking about three substances that are normally found in blood but not in urine, they are leukocytes, erythrocytes and glucose.