以下为句子列表：
英文: DL-aspartic acid has been synthesized from maleic anhydride and ammonia, the yield of DL-aspartic acid was above 70% which is much higher than those reported in the literature.
中文: 摘要以顺丁烯二酸酐与氨水为原料合成DL-天冬氨酸，使其得率由现有的63%提高到70%以上，并对其反应机理进行了研究。
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