removal  this   The unusual toxicity of nhexane compared with other alkanes has resulted in the chemical industry switching away from nhexane in favour of nheptane where possible  see  httpwwwcdcgovnioshpelhtml  the ACGIH concluded that heptane was more acutely toxic than hexane The ACGIH therefore recommended limits for heptane that are somewhat lower than the limits for the hexane isomers  also because NIOSH believes that it would be incorrect to conclude that the neurotoxic properties ascribed to nhexane are unique to this compound nhexane Other alkanes or related chemicals such as heptane that are ultimately metabolized to gamma diketone may have similar toxicity  Unless there is evidence for a switch the above statement seems unlikely or simply wrong especially considering the above report