I'm trying to get a comprehensive guide to all this stuff down, but here's the quick answer.
(17 beta) estradiol, a chemical name for the main type of estrogen used by humans.
Estrace, a trademark of Bristol Myers Squibb for micronized (17 beta) estradiol.
Estratest, a trademark of Solvay Pharmaceuticals, a mixture of sodium esterone sulfate (75-85%), sodium equilin sulfate(6-15%) and methyltestosterone (<=10%).
It has been discontinued.