A new compound (1) named as winchic acid and eight known ones were isolated from the stem barks of Winchia colophylla A. DC. (collected in Xishuangbanna, Yunnan Province of China). The new compound 1 was identified as...A new compound (1) named as winchic acid and eight known ones were isolated from the stem barks of Winchia colophylla A. DC. (collected in Xishuangbanna, Yunnan Province of China). The new compound 1 was identified as 3beta-hydroxy-27-(4-hydroxy-3-methoxy-E-cinnamoyloxy)-lup-20(29)-en-28-oic acid on the basis of 1D and 2D NMR experiments. The eight known compounds were determined to be lupenone, lupenyl acetate, betulinic acid, alpha-amyrin acetate, ursolic acid, ptiloepoxide, beta-amyrin and cycloeucalenol, respectively.展开更多
D. D, Devlin in his book Jane Austen and Education claims that "all Jane Austen’s novels, and many of her minor works, unfinished piece and juvenlia, are about education." The statement may sound surprising...D. D, Devlin in his book Jane Austen and Education claims that "all Jane Austen’s novels, and many of her minor works, unfinished piece and juvenlia, are about education." The statement may sound surprising, for people nowadays are apt to think that education is something that takes place only in school. Fortunately, Jane Austen did not think the way many of u do now; she thought that education began at home, and the first teachers were parents; she held that education was both an intellectual experience and展开更多
文摘A new compound (1) named as winchic acid and eight known ones were isolated from the stem barks of Winchia colophylla A. DC. (collected in Xishuangbanna, Yunnan Province of China). The new compound 1 was identified as 3beta-hydroxy-27-(4-hydroxy-3-methoxy-E-cinnamoyloxy)-lup-20(29)-en-28-oic acid on the basis of 1D and 2D NMR experiments. The eight known compounds were determined to be lupenone, lupenyl acetate, betulinic acid, alpha-amyrin acetate, ursolic acid, ptiloepoxide, beta-amyrin and cycloeucalenol, respectively.
文摘D. D, Devlin in his book Jane Austen and Education claims that "all Jane Austen’s novels, and many of her minor works, unfinished piece and juvenlia, are about education." The statement may sound surprising, for people nowadays are apt to think that education is something that takes place only in school. Fortunately, Jane Austen did not think the way many of u do now; she thought that education began at home, and the first teachers were parents; she held that education was both an intellectual experience and
