the precursors -- namely , progesterone , pregnenolone , 17 alpha-progesterone , 17 alpha-hydroxypregnenolone , androstenedione , and dehydroepiandrosterone -- caused a 2- to 3 1/2-fold enhancement of guanylate cyclase activity in rat liver , kidney , skeletal muscle , and ventral prostate at a concentration of 1 microm .
C0373704
pregnenolone
C0376260
17 alpha-hydroxypregnenolone