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The structure of the new metabolite was characterised as 4 - ( 4 - hydroxy - phenyl ) - 3H - pyran - 2 , 6 - dione using 1D and 2D NMR spectroscopy .
 Chemical: 4 - ( 4 - hydroxy - phenyl ) - 3H - pyran - 2 , 6 - dione
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 4 - ( 4 - hydroxy - phenyl ) - 3H - pyran - 2 , 6 - dione