11β,21-Dihydroxy-4-pregnene-3,20-dione Reichstein’s Substance H 11β,21-Dihydroxyprogesterone Kendall’s Compound B 4-Pregnene-11β,21-diol-3,20-dione,(11beta)-11,21-Dihydroxy-pregn-4-ene-3,20-dione,"Glucocorticoid; an intermediate in the biosynthesis of aldosterone, isolated from the adrenal cortex.",Corticosterone API