9604
Conformational analysis of these cytotoxic 6 - heptyl - 5 , 6 - dihydro - alpha - pyrones was carried out on compound 9 by application of a protocol based on comparison between experimental and DFT - calculated vicinal ( 1 ) H - ( 1 ) H NMR coupling constants .
 Chemical: 6 - heptyl - 5 , 6 - dihydro - alpha - pyrones; Chemical: ( 1 ) H - ( 1 ) H
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: 6 - heptyl - 5 , 6 - dihydro - alpha - pyrones; Chemical: ( 1 ) H - ( 1 ) H