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This image contains three line-angle formulas of three estrogen molecules: estriol on the left, estradiol in the center, and estrone on the right. The molecules line-angle formulas contain wedged and dashed bonds for three-dimensional geometry or stereochemistry.
The figure depicts three different molecular structures of estrogen found in mammals’ that differ by the arrangement of bonds and side groups. The molecular structures of the three estrogen molecules differ by the arrangement of chemical bonds and side groups attached to the core steroid structure, cholesterol, which contains three cyclohexane rings and one cyclopentane ring.