In enzymology, an isovaleryl-CoA dehydrogenase is an enzyme that catalyzes the chemical reaction 3-methylbutanoyl-CoA + acceptor ⇌ {\displaystyle \rightleftharpoons } 3-methylbut-2-enoyl-CoA + reduced acceptorThus, the two substrates of this enzyme are 3-methylbutanoyl-CoA and acceptor, whereas its two products are 3-methylbut-2-enoyl-CoA and reduced acceptor. Wikipedia