however , this discloses for the first time that the conversion of pregnenolone proceeds very fast : progesterone , 17 alpha-hydroxyprogesterone , and 17 alpha-hydroxypregnenolone as the only important delta 5 intermediate , peak and decline again to almost undetectable levels within the first 15 min of incubation .
C0373704
pregnenolone
C0376260
17 alpha-hydroxypregnenolone