常見例句The phenylacetyl ethanolamine,a low toxic precurson of benzylpenicillin,was synthesized by using ethyl phenylacetate and colamine as raw materials.以苯乙酸乙酯和乙醇胺為原料合成了芐青霉素低毒前體苯乙?；掖及贰?/li> 返回 phenylacetyl