18823
Studies on an ( S ) - 2 - amino - 3 - ( 3 - hydroxy - 5 - methyl - 4 - isoxazolyl ) propionic acid ( AMPA ) receptor antagonist IKM - 159 : asymmetric synthesis , neuroactivity , and structural characterization .
 Chemical: ( S ) - 2 - amino - 3 - ( 3 - hydroxy - 5 - methyl - 4 - isoxazolyl ) propionic acid; Chemical: AMPA; Chemical: IKM - 159
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: ( S ) - 2 - amino - 3 - ( 3 - hydroxy - 5 - methyl - 4 - isoxazolyl ) propionic acid; Chemical: AMPA; Chemical: IKM - 159