Acts on prostaglandins E2, F2alpha and B1, but not on prostaglandin D2 [cf. EC
1.1.1.141 15-hydroxyprostaglandin dehydrogenase (NAD+) and EC
1.1.1.196 15-hydroxyprostaglandin-D dehydrogenase (NADP+)]. May be identical with EC
1.1.1.189 prostaglandin-E2 9-reductase.