Term Name:	diacetyl reductase ((S)-acetoin forming) (NAD+) activity
Synonyms:	(S)-acetoin dehydrogenase activity
Definition:	Catalysis of the reaction: (S)-acetoin + NAD+ = diacetyl + H+ + NADH. This reaction is catalyzed in the reverse direction.
Ontology:	GO: Molecular Function [GO:0052588]    QuickGO    AmiGO