5264
Testing our double mutants against racemic sarin , we observed reduced values of KM for H115W / F347W that modestly improved catalytic efficiency over wild type and H115W .
 Chemical: racemic sarin
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: racemic sarin