Reaction catalyzed by 3-dehydrosphinganine reductase (1.1.1.102)

	2-amino-1-hydroxyoctadecan-3-one	+		NADPH	=			+		NADP+
	2-amino-1-hydroxyoctadecan-3-one	+		NADPH	=		(2S,3R)-2-aminooctadecane-1,3-diol	+		NADP+