15694
Their structures were assigned to be 3 - alkylated 6 - ( 1 - methyl - 1 - propenyl ) - 2H - pyran - 2 - ones on the basis of UV , MS , NMR , and high resolution ( HR ) - FAB - MS analyses .
 Chemical: 3 - alkylated 6 - ( 1 - methyl - 1 - propenyl ) - 2H - pyran - 2 - ones
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: 3 - alkylated 6 - ( 1 - methyl - 1 - propenyl ) - 2H - pyran - 2 - ones