YUNNANXANE AND ITS HOMOLOGOUS ESTERS FROM CELL-CULTURES OF TAXUS-CHINENSIS VAR MAIREI

From cell cultures of Taxus chinensis var. mairei, yunnanxane [2 alpha ,5 alpha,10 beta-triacetoxy-14 methyl-3'-hydroxyl)-butyryloxy-4(20),11 -taxadiene, [1], and four new homologous esters, 2 alpha,5 alpha,10 be ta,14 beta-tetra-acetoxy-4(20),11-taxadiene [2], 2 alpha,5 alpha,10 be ta-triacecoxy-14 beta-propionyloxy-4(20),11-taxadiene [3], 2 alpha,5 a lpha,10 beta-triacetoxy-14 beta-isobutyryloxy-4(20),11-taxadiene [4], and 2 alpha,5 alpha,10 beta-triacetoxy-14 beta-(2'-methyl)-butyryloxy- 4(20),11-taxadiene [5] have been isolated. Their structures were deter mined by spectroscopic methods.