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    $\begingroup$ Where you're going wrong is to trust the source that tells you that these are diastereomers instead of trusting your own work. Just rotate the right structure by 180-degrees, and the mirror plane is pretty clear. $\endgroup$
    – Zhe
    Commented Mar 25 at 14:45
  • $\begingroup$ @Mithoron Is that a justification for the downvote? $\endgroup$
    – Bongo Man
    Commented Mar 25 at 15:43
  • $\begingroup$ Edited post can be downvoted. chemistry.meta.stackexchange.com/questions/57/… $\endgroup$
    – Mithoron
    Commented Mar 25 at 16:16
  • $\begingroup$ @Mithoron If you feel it hinders the search features of Chem.SE or the "discoverability" of the question, feel free to make the suitable edits, I'll gladly approve them :) $\endgroup$
    – Bongo Man
    Commented Mar 25 at 17:11
  • $\begingroup$ The down vote was probably because the first illustration simply switches the configurations not showing the mirror image. the diastereomer would be the cis isomer RS becoming SR $\endgroup$
    – jimchmst
    Commented Mar 28 at 22:57