C<sub>30</sub>-C<sub>32</sub> LANOSTANES——A NOVEL SERIES OF TETRACYCLIC TRIT

来源 :中国科学:化学英文版 | 被引量 : 0次 | 上传用户:ssqq56
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A series of novel tetracyclic triterpanes based on the lanostane skeleton, ranging in cars-bon number from C<sub>30</sub> to C<sub>32</sub>, were identified for the first time in Eocene lacustrine depo-its of Biyang Depression, Chi
其他文献
Erythromycin sensitive electrodes have been proposed. Their selectivity toward quaternary ammoniums is described in terms of induction effect and steric hindran
Deoxycorticosterone acetate, injected daily for 5, 10, 20 or 30 days, reduced the serum potassium levels of rats by about 25%, a decrease that was independent o
The structures of yingzhaosu C(3) and D(4) have been determined by spectroscopicanalysis in combination with chemical degradation.
The Meishucunian Stage is rich in fossils and is characterized by their distinct evolutionsequence, so based on the established zonation of small shelly fossils
The linear relationship between the chemical shift of the resenant nucleus and the localvan der Waals steric energy calculated by molecular mechanics with MM2 f
Magnetostratigraphic studies of 112 cores specimens (249 samples) in a Precambrian-Cambrian section at Meishucun, Jinning County, Yunnan Province reveal the fol
A new type of MCCS (microcells connected in series) has been constructed and its performances investigated. It has been applied to the determination of streptom
Based upon the effect of land-sea interaction on the paleomonsoon variation and the time series of climatic proxy-indicators, the historical Asian monsoon varia
A 2.0 kb fragment DNA plasmid which expresses antisense to the upstream first exon of c-Ha-ras oncogene was transfected into Ha-ras transformed cell lines, GCM-
All attempts to prepare light lanthanide dicyclopeutadienyt chloride failed,due to the disproportionation reaction. The crystal complex of [(η5-C5H5)2NdCl.OC4H8]
期刊