19787
In the present work , GSH ( 1 ) or ( R ) - alpha - lipoic acid ( LA ) ( 2 ) have been covalently linked with the NMDA receptor antagonists memantine ( MEM ) .
 Chemical: GSH; Chemical: ( R ) - alpha - lipoic acid; Chemical: NMDA; Chemical: memantine; Chemical: MEM
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: GSH; Chemical: ( R ) - alpha - lipoic acid; Chemical: NMDA; Chemical: memantine; Chemical: MEM