<正>Three new cycloartane triterpene glycosides were isolated from the rhizomes of Actaea asiatica. Their structures were elucidated as 25-ethoxyl-cimigenol-3-O
Xanthenedione derivatives were prepared through InCl3·4H2O promoted condensation of aldehydes with 5, 5-dimethyl-1, 3-cyclohexandione in [bmim][BF4]. The a
This papergives firstly a brief introduction about the theory of needs analysis and target needs. Needs analysis is also known as needs assessment as well as pr