24719
Respective mean Km and Vmax values for R - and S - lorazepam by HLM were 29 +/- 8 . 9 and 36 +/- 10 mu M , and 7 . 4 +/- 1 . 9 and 10 +/- 3 . 8 pmol / min . mg .
 Chemical: R - and S - lorazepam
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: R - and S - lorazepam