[Chemical Constituents from Usnea longgisima, a Traditional Mongolian Medicine(II)].

OBJECTIVE: To study the chemical constituents of traditional Mongolian medicine Usnea longissima. METHODS: The compounds were isolated and purified by the methods of solvent extraction and chromatographic technique, and their structures were identified on the basis of the analyses of spectral data. RESULTS: Three compounds were obtained and identified as 4-hydroxy-2-[ (2-hydroxy-4-methoxy-6-methylbenzoyl) oxy]-6-methylbenzoic acid (1), dibutyl phthalate (2) and diisobutyl phthalate (3). CONCLUSION: Compound 1 is a new compound and named as isoevernic acid, compounds 2 and 3 are isolated from Usnea longissima for the first time.

[Chemical Constituents in Petroleum Ether Extract of Mongolian Medicine Halenia corniculata].

OBJECTIVE: To study the chemical constituents of Mongolian medicine Halenia corniculata. METHODS: Positive phase and reversed phase silica gel, as well as Sephadex LH-20 methods were used to separate and purify. The structure of the isolated constituents was identified according to the NMR spectroscopy data and the literature data. RESULTS: Nine compounds were isolated from 95% ethanol extracts of petroleum ether part of Halenia corniculata and identified as: 1-hydroxy-2,3,4,6-tetramethoxyxanthone (1), 1-hydroxy-2,3, 5-trimethoxyxanthone (2) 1-hydroxy-3,7-dimethoxyxanthone (3), 1-hydroxy-3,5,6,7,8-pentamethoxyxanthone (4), 1-hydroxy-2,3,4, 7-tetramethoxyxanthone (5), 1-hydroxy-3,5-dimethoxyxanthone (6),1-hydroxy-2,3,4,5,7-pentamethoxyxanthone (7), palmitic acid (8) and ß-sitosterol (9). CONCLUSION: Compounds 3, 4 and 8 are isolated from this genus for the first time, Compound 1 is isolated from this plant for the first time.