21. It is present in chili peppers, but is commonly manufactured synthetically . 22. Iron tetraboride does not occur in nature and can be created synthetically . 23. The finding made it possible to produce the molecule of the vitamin synthetically . 24. It is also called folic acid when synthetically added to vitamins and food. 25. Endostatin is the trade name of the drug being made synthetically by EntreMed. 26. Potassium sulfate : Natural mineral also manufactured synthetically ; highly soluble potassium source. 27. The " Critique of Pure Reason " investigates this question synthetically . 28. Genome-wide studies are predicated on the synthetically linked to common variants. 29. Thus inhibition of PD-1 is primarily synthetically lethal with MMR defects. 30. Synthetically , neurine can be prepared by the reaction of acetylene with trimethylamine.