3370
Since this drug contains 2 chiral carbons , clearly there is 4 possible isomers : ( SS ) , ( RR ) , ( RS ) , and ( SR ) ; often referred to as a diastereomeric pair of enantiomers .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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