preferred_name: 17beta-hydroxy-3,19-dioxo-5alpha-androstanone + reduced [NADPH--hemoprotein reductase] + O2 => 17beta-hydroxy-3-oxo-19-nor-5alpha-androst-1-ene + formate + oxidized [NADPH--hemoprotein reductase] + H2O + 2 H(+)