New benzoquinone derivatives from maese lanceolata

ABSTRACT

The aerial of Maesa lanceolata yieded two new benzoquinones 2-hydroxy-5- methoxy- 3- pentadecyl-1,4- benzoquinone [2] and 3- [[z]-10-pentadecenyl]-2.5-dihydroxy-6- methyl-1,4 benzoquinone [3]. Their structural assignments were largely based on 1D and2D NMR spectroscopic data and chemical derivatization. both compounds were found to be structurally related to the host defense stimulant maesanin [1]