Thalidomide has one chiral atom and so exists as two enantiomers which are mirror images. The well known tragedy of  thalidomide  indicates the complexity and sensitivity of biological systems. Laboratory tests after the thalidomide disaster showed that in some animals the 'S' enantiomer was tetragenic but the 'R' isomer was an effective sedative. However, it is now known that at physiological pH thalidomide can racemize (interconvert between enantiomers). While this drug is still used today, it is only used under strict precaution against pregnancy.

These two molecular models come from the US NIH where any molecular structure can be converted into a printable file. http://3dprint.nih.gov/ 

Goal here is to print them each separately, then together on some sort of support showing their mirrored alignment.