APPENDIX I 



CH3 ^OH 



ESTRADIOL 

 Estriolf which occurs abundantly in the human placenta, is 



CH3 ^OH 



ESTRIOL 



Equilenin, isolated from mare's urine, belongs to a group 

 of estrogenic substances which have unsaturated carbon 

 atoms in the second ring as well as the first : 



CH3 ^0 



EQUILENiN 

 { U9 } 



