They are all chiral molecules and belong in the racemate.
它们都是手性分子,属于外消旋体。
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If you position the version of the molecule that's considered " right-handed" , called the R enantiomer, so the closest oxygen atom to the chiral center is below it, the hydrogen atom attached to the center will be facing away from you.
如果你找到认为是“右撇子”的分子变体,即R对映体,那么离手性中心最近的氧原子在它的下方,附在中心的氢原子将背朝你。