"Soy derivatives" refers to substances or ingredients that are derived or extracted from soybeans. These derivatives could include various products such as soybean oil, protein isolates, or other substances made from soybeans. Full definition
In the U.S., the soybean industry is filling our shelves with soy derivatives such as soy flour, textured soy protein, partially hydrogenated soybean oil, and soy protein isolate — none of which were part of the traditional Japanese diet. (virginiahopkinstestkits.com)
And that is if we are talking about whole soybeans, not highly processed soy derivatives. (fitwirr.com)