thyl-2′′-butenyl)-β-D-galactopyranosyl]-11,12-methylene-1,3-docosanediol} is a prenylated galactosphingolipid isolated as an immunosuppressant from the marine sponge Plakortis simplex. The absolute configuration of plakoside A was determined as 11S,12R,11′′′S,12′′′R by its degradation to two cyclopropane-containing fatty acids 2a and 3a followed by their derivatization with a chiral reagent 4 and subsequent
Plakoside A(1)(2 S,3 R,11 R *,12 S *)-2-[(2''' R,5''' Z,11''' R *,12''' S *)-2'''-羟基-11'',, 12'''-亚甲基-5''-二十二碳
三烯基] -1- O- [2'- O-(3''-甲基-2'' -
丁烯基)-β-D-
吡喃半
乳糖基] -11,12-亚甲基-1,3-
二十二烷二醇}是从海洋海绵Plakortis单纯体中分离的作为
免疫抑制剂的烯丙基半
乳糖鞘脂。白
果糖苷A的绝对构型确定为11 S,12 R,11''' S,12''' R通过将其降解为两个含
环丙烷的
脂肪酸2a和3a,然后用手性试剂4对其进行衍生化,然后对所得衍
生物2b和3b进行HPLC分析。(©Wiley-
VCH Verlag GmbH,69451 Weinheim,Germany,2002)