30063
For the first time microwave measurements of the $ \ Lambda $ - doubling transitions of $ ^ { 17 } $ OH isotopologue are combined with THz data successfully .
 $ ^ { 17 } $ OH
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 $ ^ { 17 } $ OH