1. As single laevo-enantiomers,ropivacaine and levobupivacaine which have been generally researched are attracting extensive attention for their better anaesthetic effect and less system toxicity.
   近年研究较多的罗哌卡因和左旋布比卡因作为单一的左旋对映异构体,因其良好的局麻效应和较小的全身毒性正引起广泛的关注。

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