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Other names for tartaric acid are:
2,3-dihydroxysuccinic acid
threaric acid
racemic acid
uvic acid
paratartaric acid
You think probable to sodium ammonium salt of racemic acid.
its there. for the answer consult akash at akash.jonas@yahoo.com
Grapes contain many different chemicals, including racemic acid which gives grapes their tartness.
it can be done by an enzyme called racemase which converts one racemic form to other