(8S,9S,10R,13S,14S,17S)-17-(2-hydroxyacetyl-d2-d2)-10,13-dimethyl-1,6,7,8,9,10,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthrene-3,11(2H)-dione-2,2,4,6,6,9,12,17-d8,(8S,9S,10R,13S,14S,17S)-17-(2-hydroxyacetyl-d2-d2)-10,13-dimethyl-1,6,7,8,9,10,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthrene-3,11(2H)-dione-2,2,4,6,6,9,12,17-d8,Corticosterone Stable Isotopes