rutin

[ root-n ]

/ ˈrut n /

a bright yellow or greenish-yellow substance, C27H30O16, obtained chiefly from buckwheat, and used in the treatment of capillary fragility.

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< German Rutin (1842) < New Latin Rut(a) rue, a source of the substance (see rutaceous) + German -in -in²

Rutin (or rutinic acid), according to Weiss, is a glucoside which exists in the form of fine needles, bright yellow in color.
The Medicinal Plants of the Philippines|T. H. Pardo de Tavera