obsolete 22-alpha-hydroxy-campest-4-en-3-one,NADPH:steroid 5alpha-reductase activity (obsolete GO:0102678)
OBSOLETE. Catalysis of the reaction: (5alpha,22S,24R)-22-hydroxyergostan-3-one + NADP = H+ + (22S)-22-hydroxycampest-4-en-3-one + NADPH.