the result indicates that , in boar testis , androsta-5,16-dien-3beta-ol is synthesized from pregnenolone by a pathway in which 17 alpha-hydrogen atom of pregnenolone is retained throughout the reaction , excluding 17 alpha-hydroxypregnenolone and 3beta-hydroxyandrost-5-en17-one as intermediates .
C0373704
pregnenolone
C0376260
17 alpha-hydroxypregnenolone