19450
The monomers required for generating the pcPNA were obtained by an improved synthesis strategy and were incorporated into a PNA actuator sequence as well as into a short DNA strand that subsequently was integrated into the rotaxane architecture .
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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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