894
Bis - loop tetraurea calix [ 4 ] arene 6 has been prepared by acylation of the wide - rim calix [ 4 ] arene tetraamine 1 with the activated bis ( urethane ) 8 under dilution conditions .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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