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Complex 1 ( 2 + ) is a rare example of a ruthenium complex which ' turns on ' both reactivity and luminescence upon switching to a hydrated state .
 Chemical: ruthenium
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: ruthenium