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We have examined the effectiveness of two novel Chk1 selective inhibitors , AR323 and AR678 , in a panel of melanoma cell lines and normal cell types .
 Chemical: AR323; Chemical: AR678
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: AR323; Chemical: AR678