咯痰不爽: cough with difficulty in expectorationdifficult expectoration
Example Sentences:
1.
The synthesis and resolution of the optical active derivatives of ketorolac 光活性酮咯酸衍生物的合成与拆分
2.
Synthesis and antibacterial activity of azithromycin 4 quot; - substituted benzal hydrazinoformate derivatives 光活性酮咯酸衍生物的合成与拆分
3.
Methylbenzyl amine as chiral auxiliaries to react with racimic ketorolac . then authors got optical amides . the diastereoisomeric mixture were separated by column - chroatography on silica gel . the results of separation depend on the structure of r 苯乙胺作为手性辅基，与外消旋酮咯酸生成一对光学活性的酰胺衍生物，再用简单易行的柱层析方法分离其非对映异构体。
