It also has organic acids, flavonoids, sitosterol and stigmasterol. In plants, squalene is the precursor to stigmasterol. Examples include fusidic acid, lanosterol, and stigmasterol. Progesterone can also be made from the stigmasterol found in soybean oil also. Chemical synthesis of progesterone from stigmasterol and pregnanediol was accomplished later that year. Neem oil also contains several sterols, including campesterol, beta-sitosterol, and stigmasterol. Being a steroid, stigmasterol is precursor of anabolic steroid boldenone. Poriferasterol and stigmasterol are the components of the aerial parts. So have cinnamic acid, p-methoxycinnamic acid, and stigmasterol. Stigmasterol is a constituent of various vegetables, legumes, nuts, seeds, and unpasteurized milk.