Isolation of two benzocoumarins from ‘clover stone’ a type of renal calculus found in sheep

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Abstract
Two known benzocoumarins have been isolated from renal calculi, known as "clover stone", which are found in sheep in some areas of Western and South Australia. One of these compounds is identical with the natural product castoreum pigment I from the scent gland of the beaver; the other has not previously been found in Nature. Both, although not themselves known in the plant kingdom, are closely related to ellagic acid. Although each of the isolated benzocoumarins is a monocarbonyl compound each exhibits a double band in the carbonyl-stretching region of the infrared-absorption spectrum.