[New dibenzofuran and anthraquinone from Usnea longissima].
OBJECTIVE
To study the chemical constituents of 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
Two compounds were obtained and identified as 3, 6-diacetyl-2, 7, 9-trihydroxy-8, 9b-dimethyl-1 [9bH]-dibenzofuranone(1) and 1, 3, 8-trihydroxy4, 6-dimethyl-9, l0-anthracenedione(2), respectively.


CONCLUSIONS
Compounds 1 and 2 were new compounds and were named as longiusnine and longissimausnone, respectively.
Feng
Jie
J
State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China.
Yang
Xiuwei
X
D000880:Anthraquinones / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification*; D001572:Benzofurans / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D020949:Usnea / Q000737:chemistry*
D000880:Anthraquinones; D001572:Benzofurans; C023614:dibenzofuran