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In earlier work [ Gruzman , D . ; Karton , A . ; Martin , J . M . L . J . Phys . Chem . A 2009 , 113 , 11974 ] , we showed that conformer energies in alkanes ( and other systems ) are highly dispersion - driven and that uncorrected DFT functionals fail badly at reproducing them , while simple empirical dispersion corrections tend to overcorrect .
 Chemical: alkanes
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: alkanes