in the chromatogram , fraction 2 ( f2 ) including four pregnane steroids ( 17-hydroxypregnanolone , pregnanolone , pregnanediol , and pregnanetriol ) reflected the biologic activity of molar human chorionic gonadotropin ( hcg ) , and the ratio of f2 to fraction 1 ( f1 ) ( 17-ketosteroids ) was found useful in monitoring secondary growth of trophoblastic tumor : urinary log f2/f1 after curettage declined quickly and unidirectionally in hm , but the same parameter exhibited a temporal rise in ca at 11 to 20 days after curettage because of the molar hcg from residual tumor tissue .
C0033006
pregnane
C0033008
pregnanolone