16831
In an underdoped La1 . 9Sr0 . 1CuO4 film ( Tc = 26 K ) , we observe collective excitations of CDW that persist up to 100 K .
 Chemical: La1 . 9Sr0 . 1CuO4
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: La1 . 9Sr0 . 1CuO4