20839
The absolute configurations of ( - ) - 1 , ( + ) - 1 , and 2 were determined by TDDFT ECD calculations of solution conformers , online HPLC - ECD analysis , and the modified Mosher method .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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