1-hydroxycholecalciferol [ 1alpha-OHD3,1 alpha-hydroxycholecalciferol,1 alpha-hydroxyvitamin D3,1-alpha-oxycholecalciferol,1-hydroxycholecalciferol, (1alpha,3alpha-(5Z,7E))-isomer,1-hydroxycholecalciferol, (1beta)-(5Z)-isomer,1-hydroxycholecalciferol, (1beta,3beta-(5E,7E))-isomer,1-hydroxycholecalciferol, aluminum salt,APS brand of alfacalcidol,AlfaD,Bondiol,Byk Tosse brand of alfacalcidol,Doss brand of alfacalcidol,Eenalfadrie,EinsAlpha,Etalpha,Farmacusi brand of alfacalcidol,Gry brand of alfacalcidol,Leo brand of alfacalcidol,Oksidevit,One-Alpha,Teva brand of alfacalcidol,Un-Alfa,alfacalcidol,alphacalcidol ] RN refers to (1alpha,3beta,5Z,7E)-isomer; a vitamin D analog