Sodium tert butoxide is what I have heard, strong tertiary base, make a water soluble salt out of the estradiol without affecting the testosterone propionate ester.
^^converting synovex cattle implants to test prop while getting rid of the nasty estrogen thats in there. Haven't done this since 2001. I think the kit makers like to keep it secret like the "magic dissolving solution" . can't remmber what the chemical is to get rid of the estrogen