18871
For the most stable complex , [ Cr ( pyridine ) 2 ( CH4 ) ] ( 2 + ) , the structures , energies , and spin states of the key intermediates and products in the oxidative addition / reductive elimination pathway have been investigated .
 Chemical: [ Cr ( pyridine ) 2 ( CH4 ) ] ( 2 + )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: [ Cr ( pyridine ) 2 ( CH4 ) ] ( 2 + )