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DMI ref. omg065     Image title: Hippuric acid crystal | 14.48 Copyright 2006 David Malin Images Hippuric acid, (CAS# 495-69-2, N-Benzoylglycine) was first identified in 1773, and is an organic acid found in the urine of horses and other herbivores, as might be guessed from its name. Monochrome, unpolarized light.