(5S,6E,8S,9S,12R,13E,15E)-5-((tert-butyldimethylsilyl)oxy)-6-chloro-5,12-dimethoxy-2,6,8,16-tetramethyl-3-oxospiro[2-aza-1(1,3)-benzenacycloheptadecaphanene-11,2'-[1,3]dithiane]-6,13,15-trien-9-yl carbamate

安丝菌素 P 3

(-)-maytansinol