8488
The formation of ( TiO ( 2 ) ) ( x ) ( Cu ( 2 ) O ) ( y ) solid - solutions is investigated using a global optimization evolutionary algorithm .
 Chemical: ( TiO ( 2 ) ) ( x ) ( Cu ( 2 ) O ) ( y )
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: ( TiO ( 2 ) ) ( x ) ( Cu ( 2 ) O ) ( y )