Shirley R, Sutor D J
Science. 1968 Feb 2;159(3814):544. doi: 10.1126/science.159.3814.544.
A second form of anhydrous uric acid has been found in urinary calculi; it is probably derived as an artifact from uric acid dihydrate during storage. It has been prepared in the laboratory by desiccation of uric acid dihydrate. Mixtures of these two substances sometimes give x-ray powder patterns that resemble that of xanthine on weak photographs, but are distinguishable by their infrared spectra.
在尿结石中发现了无水尿酸的第二种形式；它可能是在储存过程中由二水合尿酸作为一种人工产物衍生而来。它已在实验室中通过二水合尿酸的干燥制备得到。这两种物质的混合物有时在弱照片上会给出类似于黄嘌呤的X射线粉末图谱，但可通过它们的红外光谱加以区分。
