Only three distinct stereoisomers of 1,3-dimethylcyclohexane are possible. These include a pair of enantiomers (bottom) and a single achiral stereoisomer (top) that is diastereomeric with each of the chiral stereoisomers. Source: Stereochemistry, The Organic Chemistry of Medicinal Agents Citation: Renslo A. The Organic Chemistry of Medicinal Agents; 2016 Available at: http://accesspharmacy.mhmedical.com/DownloadImage.aspx?image=/data/books/1731/renslo_ch03_fig-03-06.png&sec=116669156&BookID=1731&ChapterSecID=116669137&imagename= Accessed: November 14, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved