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.

近年研究较多卡因和左旋布比卡因作为单一左旋对映异构体,因其良好局和较小全身毒性正引起广泛关注。