we used a zorbax ods column and a mobile phase of methanol/isopropanol/water ( 44/10/46 , by vol ) , which well resolves the steroids cortisone , cortisol , corticosterone , 11-deoxycortisol , 11-deoxycorticosterone , androstenedione , 17-hydroxyprogesterone , and progesterone , but not 11-deoxycorticosterone and androstenedione .
C0020387
17-hydroxyprogesterone
C0033308
progesterone