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Ropivacaine-ET-S Ropivacaine-007-S Ropivacaine Impurity 4 Ropivacaine EP Impurity D N-2-Desmethyl Ropivacaine Ropivacaine N-Ethyl Analog Ropivacaine Impurity D（EP） D Ropivacaine Impurity D(EP) Ropivacaine Hydrochloride EP Impurity D (S)-N-(2,6-dimethylphenyl)-1-ethylpiperidine-2-carboxamide (2S)-N-(2,6-dimethylphenyl)-1-ethylpiperidine-2-carboxamide 2-Piperidinecarboxamide, N-(2,6-dimethylphenyl)-1-ethyl-, (2S)- Ropivacaine impurity 5/Ropivacaine EP Impurity D/N-2-Desmethyl Ropivacaine/(S)-N-(2,6-dimethylphenyl)-1-ethylpiperidine-2-carboxamide