[Study on carbazole alkaloids of Murraya microphylla].

Four carbazole alkaloids were isolated from the methanol extract of Murraya microphylla. Their structures were identified by spectral analysis and chemical evidence, which were identified as koenigine, bis-6-hydroxy-7-methoxygirinimbine, girinimbine and mukonicine. All the compounds were discovered from this plant for the first time, and bis-6-hydroxy-7-methoxygirinimbine was a new compound.