File:Chemical structures of major endogenous estrogens.png
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![File:Chemical structures of major endogenous estrogens.png](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Chemical_structures_of_major_endogenous_estrogens.png/727px-Chemical_structures_of_major_endogenous_estrogens.png?20180424025652)
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