2395
The effectiveness of D - cycloserine ( DCS ) , an N - methyl - D - aspartate glutamate receptor partial agonist , and valproic acid ( VPA ) , a histone deacetylase inhibitor , in facilitating the extinction of fear - conditioned memory has been explored in humans and animals .
 Chemical: D - cycloserine; Chemical: DCS; Chemical: N - methyl - D - aspartate glutamate; Chemical: valproic acid; Chemical: VPA
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: D - cycloserine; Chemical: DCS; Chemical: N - methyl - D - aspartate glutamate; Chemical: valproic acid; Chemical: VPA