“…It was first prepared in 1900 by Willstátter (292), who was interested in the position of the carboxyl group in hygric acid. This substance is obtained by oxidizing (289) hygrine and cuscohygrine, alkaloids found by Liebermann (287) in Peruvian cusco leaves. They are closely related to cocaine and tropa-cocaine.…”
“…It was first prepared in 1900 by Willstátter (292), who was interested in the position of the carboxyl group in hygric acid. This substance is obtained by oxidizing (289) hygrine and cuscohygrine, alkaloids found by Liebermann (287) in Peruvian cusco leaves. They are closely related to cocaine and tropa-cocaine.…”
Das Hygrin bedarf, namentlich nachdem sich die von uns dargestellte Hygrinsiiure') durch die Untersuchungen von L a d e n b u r g a) rnit keiner der 3 isomeren Piperidincarbonsiiuren als identisch erwiesen hat, sehr der weiteren Aufklarung.
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