辅酶A（Coenzyme A,HSCoA,CoA-SH) Reactive thiol group H Adenine HS-CH2-CH CH2一CH B-Mercapto- O OHCH ethylamine Pantothenic acid Ribose 3'-phosphate 0 -0 0 CH,-C S-CoA 3'-Phosphoadenosine diphosphate Acetyl-CoA Coenzyme A 辅酶A（Coenzyme A, HSCoA, CoA-SH）