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Urine my lord ;-)
Composed not only of uric acid but also urea and various ammonia type compounds, plus whatever food/drink breakdown products the body rejects

http://www.ivy-rose.co.uk/HumanBody/Urinary/Urinary_System_Composition_Urine.php
"The pH of normal urine is generally in the range 4.6 - 8"
Other major component Creatinine