Estrogen isn't a molecule. It's a class of feminizing hormones, the most prominent of which is estradiol. Others include estrone and estriol. Collectively, these are called estrogens.
The masculinizing analog for estrogen is androgen (a word you practically never hear*), which also refers to a class of hormones. In addition to being the most well-known of the androgens, testosterone might be the most famous hormone in the whole body**. Dihydrotestosterone is actually the most potent androgen. Androsterone and Androstenedione are (relatively weak) others.
*e.g. It's such an androgen fest!
**Adrenaline is the only competitor that comes to mind.
This moment of pedantry was brought to you by TankieTanuki. 
Yeah men’s buttons are on the right side, women’s are on the left.
In the long ago women’s clothes were very complicated so (rich) women would have servants help dress them, so the buttons on women’s clothes are meant for a second person to button them.
Vs men’s clothes even kings would dress themselves because it was easy, so the weird things we have are like, the bottom button on suit jackets that is never supposed to be buttoned bc some king wasn’t able to button his jacket