in comparative studes , the metabolism of retro-progesterone ( 9 beta,10alpha-pregn-4-ene-3 , 20-dinoe ) and 17-hydrozy-retro-progesterone ( 17-hydroxy-9 beta , 10 alpha-prgn-4-ene-3 , 20-dione ) as well as of progesterone and 17-hydroxy progesterone was investigated .
C0033308
progesterone
C0020387
17-hydroxy progesterone