Is (R*,S*)-4,4'-(1,2-diethylethylene)bis(phenol) vegan?

Hexestrol is also known as (R*,S*)-4,4'-(1,2-diethylethylene)bis(phenol).

Hexestrol is a synthetic nonsteroidal estrogen historically used in estrogen replacement therapy and for hormone-dependent cancers and gynecological disorders, now mostly discontinued.

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