racemic

adj. derived from grapes; pertaining to a compound in which racemism occurs

In chemistry, a racemic mixture is one that has equal amounts of left- and right-handed enantiomers of a chiral molecule. The first known racemic mixture, or racemate, was 'racemic acid', which Pasteur found to be a mixture of the two enantiomeric isomers of tartaric acid.
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(a.)
Pertaining to, or designating, an acid found in many kinds of grapes. It is also obtained from tartaric acid, with which it is isomeric, and from sugar, gum, etc., by oxidation. It is a sour white crystalline substance, consisting of a combination of dextrorotatory and levorotatory tartaric acids.
  

A mixture of equal parts of the levorotatory and dextrorotatory isomers of the the same substance. Racemic mixtures are not optically active .

RACEMICO