求翻译：本文以邻硝基溴苄和乙酰氨基丙二酸酯为原料，经亲核取代、水解脱羧、酯化反应及中和反应合成了2-硝基苯丙氨酸甲酯，收率51.4%，用化学拆分的方法对2-硝基苯丙氨酸甲酯进行了拆分，2-硝基苯丙氨酸甲酯与L-（+）-酒石酸成盐，经碳酸氢钠溶液游离制备了S-2-硝基苯丙氨酸甲酯。是什么意思？

O-nitro benzyl bromide and acetyl malonate as raw materials, by nucleophilic substitution, hydrolysis decarboxylation, esterification reaction, and in and synthesized by the reaction of 2 - nitrophenyl alanine methyl ester, the yield was 51.4%, split, chemical resolution method 2 - Nitrobenzene alan

This possibility with the neighbors and nitro-bromide (c) 2 paracetamol ester as raw materials, and replaced by the pro-nuclear, water, esters, American relief response and reaction synthesis and in the 2-nitre alanine methyl ester, rate, 51.4 % of the chemicals used in the 2-way nitre alanine methy

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This article to o Nitro bromide benzyl and acetyl amino c II acid ester for raw materials, by pro-nuclear replaced, and water free carboxy, and ester of reaction and the in the and reaction synthesis has 2-Nitro benzene c ammonia acid methyl ester, received rate 51.4%, with chemical split min of met

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