左旋体是对映体中，使偏振光向左旋的异构体。通常用(-)表示左旋，(+)表示右旋。如D-构型的左旋酒石酸，其全名可写作D- (-)-酒石酸。
本发明提供了一种有望成为长效、强效的左旋体抗组胺药物，给过敏疾病患者多一种治疗的 选择。
The levo-benzhydryl piperazine derivative is expected to become a long-acting effective levo-antihistamine medicine, and provides one more treatment choice for allergic disease patients.
构成生命体的许多关键分子都有一个特定的导向，或者说是旋向性：脱氧核糖核酸右旋，氨基酸左旋。
Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left.
目的：观察左旋卡尼汀对离体大鼠心脏缺血-再灌注损伤的作用及对心肌细胞能量代谢的影响。
Objective: To study the effects of L-carnitine on myocardial ischemia-reperfusion injury and energy metabolism in rats.
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