14881
The new structure was characterized by single - crystal X - ray diffraction to have a condensed network consisting of NbO 7 polyhedra and chains of elongated CuO 4 tetrahedra .
 Chemical: NbO 7; Chemical: CuO 4
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: NbO 7; Chemical: CuO 4