19770
In this report , we prepared a panel of beta - substituted ethoxy and gamma - substituted propoxy phosphonoesters of the type p - NO ( 2 ) PhO - P ( X ) ( R ) [ ( O ( CH ( 2 ) ) ( n ) Z ] ( R = Me , Et ; X = O , S ; n = 2 , 3 ; Z = halogen , OTs ) and examined the inhibition of three AChEs by select structures in the panel .
 Chemical: beta - substituted ethoxy and gamma - substituted propoxy phosphonoesters; Chemical: p - NO ( 2 ) PhO - P ( X ) ( R ) [ ( O ( CH ( 2 ) ) ( n ) Z ]; Chemical: R = Me , Et ; X = O , S ; n = 2 , 3 ; Z = halogen , OTs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: beta - substituted ethoxy and gamma - substituted propoxy phosphonoesters; Chemical: p - NO ( 2 ) PhO - P ( X ) ( R ) [ ( O ( CH ( 2 ) ) ( n ) Z ]; Chemical: R = Me , Et ; X = O , S ; n = 2 , 3 ; Z = halogen , OTs