Ｃ２１二元羧酸是一种发展很快，性能优良的多官能物质，本文阐述了采有篦麻同的为原料，经催化脱水，高压水解制得亚油酸，再经Ｄｉｅｌｓ－Ａｌｄｅｒ加成反应制取Ｃ２１二元羧......

Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectros......