5796
In contrast to parenteral delivery of rBChE , which currently requires posttranslational modification for good plasma stability , an unmodified aer - rBChE pretreatment given 1 - 40h prior to > 1 LD50 of aer - paraoxon ( Px ) was able to prevent inhibition of circulating cholinesterase in a dose - dependent manner .
 Chemical: paraoxon
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: paraoxon