CONSTITUTION OF GLYCOCOLL AND ITS DEIUVATIYES. \0l\ 



H.,C-XH..CH..COO^ H.,C-XH(CH„.COO)X'a 



'II'' " II 



OC - OC - 



H.,C-XAuH.CH.,.COOAg HX'-X^(CH.,.COU).,Cii . 



'11^ 'II" 



OC-0 oc-o 



A word must no^\ be said with regard to the term " amido- 

 acids."*^''^ This term which is so generally employed slioidd, in 

 accordance Avith the internal anmionium theory, he dropped from 

 chemical nomenclature and re[)laced by the word (jlijcocolls, at least in 

 the case of the so-called amido-carboxylic acids. This designation is 

 to be recommended, because it is not new. and is to Ije preferred to 

 other difficult names which might be suggested as expressing con- 

 stitution. Moreover, a particular glycocoll may be easily specified by 

 prefixing (/6'('^/f, propionic, &c. ; alanine would thus ])v propionic (jhico- 

 coU. These expressions have to lie distinguished from those, which 

 are already in use to designate derivatives of a particular glycocoll. 

 such as acetvl-glycocoll (aceturic acid) and benzoyl -glycocoll (hippuric 

 acid). AVe may also use such expressions as " glycocollic constitu- 

 tion," " glycocollvl group — CO^XH;, — ." &c. without confusion or 

 other inconvenience. 



Asparagin and aspartic acid, as well as all other similar bodies, 

 such as o-hitamin, glutamic acid, leucine, leucic acid, &c. must he 

 looked u])on as glycocollyl «-ompounds. Tims, as[)aragin which is 

 usually regarded as " amido-succinamic acid," 



CU.OH 



C,H3.XH^. 



CO.XH^ , 



(5) In the ne^\- edition of his Handbuch, Beilstein changes it into " amino-acids," but very 

 little is gained h\ the alteration. 



