At the beginning of this reaction, 1 molecule of '3-Oxododecanoyl-CoA', and 1 molecule of 'CoA' are present. At the end of this reaction, 1 molecule of 'Decanoyl-CoA', and 1 molecule of 'Acetyl-CoA' are present.
This reaction takes place in the 'mitochondrial matrix' and is mediated by the 'transferase activity' of 'Trifunctional Protein'.