Xanthohumol is the main prenyl flavonoid of female inflorescences in the hops.

摘要是啤酒雌花中主要的含异烯基的类酮。

Abstract： The C5 Fraction derived from ethylene steamcracker contains some very useful components, isoprene, cyclopentadiene and piperylene.

摘 要： 来裂解乙烯的C5馏份含有非常有用的化工原料——异烯、烯、间烯。

The controls were homeochronous inpatients with affective disorder and normal individuals.lsoprene breath levels were measured by gas chromatography combined with mass spectroscopy(GC-MS).

用气相色谱一质谱联用仪检测其呼出气体中异烯的浓度。