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Analogs with Z = Br , I , or OTs were weak inhibitors of the AChEs , and methyl phosphonates ( R = Me ) were more potent than the corresponding ethyl phosphonates ( R = Et ) .
 Chemical: Z = Br , I , or OTs; Chemical: methyl phosphonates; Chemical: R = Me; Chemical: ethyl phosphonates; Chemical: R = Et
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: Z = Br , I , or OTs; Chemical: methyl phosphonates; Chemical: R = Me; Chemical: ethyl phosphonates; Chemical: R = Et