Abstract A novel natural flavone, 5-hydroxy-6, 2′-dimethoxyflavone, was isolated from the leaf exudate of Primula denticulata. Its structure was elucidated by spectral studies and confirmed by synthesis. This flavone shows unusual fragments in its mass spectrum which is caused by the stability of the molecular ion and a new fragmentation pattern is proposed. The structure of 5, 6, 2′-trimethoxyflavone, reported earlier from Sargentia greggii, is also ...
