1) Oxalacetate 2) Salt 1) Oxalacetate 
(from the article `metabolism`) ...(apart from carbon dioxide and water) one of only three possible substances: the two-carbon compound acetate, in the form of a compound called ... In the TCA cycle, acetyl coenzyme A initially reacts with oxaloacetate to yield citrate and to liberate coenzyme A. This reaction [38] is catalyzed ... ....
A four-carbon molecule found in mitochondria that condenses with acetyl conenzyme A to form citrate in the first reaction of the citric acid cydle (Krebs cycle). Oxaloacetate must be constantly regenerated in order for the citric acid cycle and the electron transport chain to continue.
<biochemistry> Metabolic intermediate. Couples with acetyl CoA to form citrate, i.e. The entry point of the tricarboxylic acid cycle. Formed from aspartic acid by transamination. ... (18 Nov 1997) ... 
(ok″sә-lo-as´ә-tāt) a salt or ester of oxaloacetic acid.
Metabolic intermediate. Couples with acetyl CoA to form citrate, ie. the entry point of the tricarboxylic acid cycle. Formed from aspartic acid by transamination.