| 单词 | Girard reagent | 
| 释义 | Girard reagentnoun  Gi·rard reagent   jə̇ˈrärd-  variants  or Girard's reagent  -dz-   : any of several hydrazides that contain a quaternary ammonium radical and are useful especially in separating aldehydes or ketones (as some steroid hormones) from mixtures by forming soluble hydrazones: such as    a    : a crystalline compound (CH3)3N(Cl)CH2CONHNH2 derived from trimethylamine or betaine  called also Girard T reagent  b    : a crystalline compound C5H5N(Cl)CH2CONHNH2 derived from pyridine  called also Girard P reagent | 
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