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Abstract
Two new naphthoquinones, 2-ethoxy-8′-hydroxyisodiospyrin (1) and 3-ethoxy-8′-hydroxyisodiospyrin (2), together with two known naphthoquinones, 6-hydroxy-5-methoxy-2-methyl-1,4-naphthoquinone and bisisodiospyrin were isolated from the stems of Diospyros maritima. The structures of 1 and 2 were established on the basis of spectroscopic data.
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Acknowledgements
This research was supported by the National Science Council, Taiwan. We thank Ms Shou-Ling Huang and Shu-Yun Sun for the NMR data acquisition and HREI-MS measurement in the Instrumentation Center of the College of Science, National Taiwan University.