Transition-metal catalysts can be easier to handle than enzymes, but usually fail to distinguish between enantiomers.

过渡金属催化剂可能比酶更容易操作，但通常无法区分对映体。

But it turns out that thalidomide's R enantiomer can actually switch to the S version while inside the human body.

但事实证明，萨力多胺中的R对映体在人体内还是可以转换成S变体。

In other words, the two enantiomers are mirror images of each other.

也就是说，这两种对映体都是它们自己的镜像。

These two chemicals are mirror images known as enantiomers.

这两种化学物质是镜像， 称为对映体。

" Enantiomers are..." - Hey, is that Chloe?

" 对映异构体是..." -这不是克洛伊吗？

And that's because the different versions of chiral molecules—called enantiomers —are made up of all the same parts, but arranged differently.

这是因为手性分子的不同变体——即对映体——是由所有相同部分组成，但是却以不同形式排列。

But if you position the " left-handed" , or S enantiomer, the same way, the hydrogen atom will be facing toward you.

但是如果你找到的是“左撇子”或是S对映体，那么氢原子将面朝你。

But it turns out that thalidomide’s R enantiomer can actually switch to the S version while inside the human body.

但事实证明，沙利度胺的 R 对映异构体实际上可以在人体内转换为 S 版本。

The S enantiomer is commonly sold over the counter as a vasodilator, and you can easily find it in vapor inhalers.

S对映体通常是作为血管舒张药在柜台销售，你可以在蒸气吸入器中轻松找到它。

In the case of thalidomide, scientists discovered that the R enantiomer helped with morning sickness, but the S enantiomer caused those severe birth defects.

在萨力多胺中，科学家发现R对映体有助于缓解晨吐，但是S对映体则会引发严重的先天缺陷。