Description This alkaloid occurs together with Neprotine (q.v.) in Berberis insignis Hook, B. umbellata Wall and Mahonia nepalensis DC. (Syn. Berberis nepalensis Spreng.). It is optically inactive and crystallizes from H2O with 5.5 H2O. It yields crystal_x0002_line salts, e.g. the nitrate, m.p. 265-7°C (dec.); sulphate, m.p. 271-3°C (dec.) and the picrate, m.p. 231°C (dec.). The base also furnishes a meth*yl ether, m.p. 265°C and on catalytic hydrogenation gives the tetrahydro derivative, m.p. 213-5°C (dec.). The ultraviolet spectrum resembles that of berberine (q.v.). Oxidation with KMn04 in Me2CO gives hemipinic acid, identified as the ethylimide, m.p. 90°C.
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