Capaurine and capauridine have been recorded as constituents of four plants, namely, Corydalis aurea WiUd., $ C. micranthu (Engelm.) Gray,'C. pall& (Thunb.) and C. montanu (Engelm.) Britton.'They are isomeric and the latter is in fact the &-form of the former. The empirical formula, G~ HsO~ N, on the basis of analogy with other Fumariaceous alkaloids, makes it highly probable that capaurine is a derivative of protoberberine. There are four ...
