lography and you recall that the designations for this based on the actual geometric configurations is
             You also recall that if you have a pure enantiomer its thermodynamically unstable and will tend to break down to give you a 50:50 mixture of 2 enantiomers. When you have such a mixture its referred to as a racemic mixture and you generally designate it as d,L or (+),(-). A good example of that would be propranolol which is designated using as d,L-propranolol, therefore when you see that you know that this drug is a racemic mixture, that is the form in which it is marketed. If it is marketed as a pure isomer then it would only have d,propranolol or l, propranolol. Now there are some compounds that have more than one chiral center and when that happens and you rotate only one of these chiral centers you will end up with a compound that is not a mirror image of the non-inverted compound and this process is referred to as epimerization and results in t
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