An alkaloid from Sophora angustifolia var. flavescens S. and Z., the bas’e crystal_x0002_lizes as the monohydrate having the lower melting point given above. It is dextrorotatory with [α]19D + 47.7° (EtOH) and yields crystalline salts and derivatives: hydrobromide, m.p. 21SoC; aurichloride, m.p. 207°C (dec.); perchlorate, m.p. 240°C (dec.); picrate, m.p. 21SoC and the methochloride aurichloride, m.p. 18SoC (dec.). Ochiai and Ito have shown that it is formed by the action of hydrogen peroxide on Matrine (q.v.), indicating that its structure is matrine-N-oxide.

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