(20S)-hydroxypregn-4-en-3-one + NADP(+) = progesterone + NADPH + H(+)
(20s)-hydroxypregn-4-en-3-one + nadp(+) = progesterone + nadph + h(+)
(20S)-hydroxypregn-4-en-3-one + NADP(+) = progesterone + NADPH + H(+)
(20s)-hydroxypregn-4-en-3-one + nadp(+) = progesterone + nadph + h(+)