All of them tend to form by simple chemical reactions between smaller components or through the activity of radicals and neutral molecules on the surface of floating dust grains. (discovermagazine.com)
Whilst building and operating such tiny machine is extremely complex, the techniques used by the team are based on simple chemical processes. (sciencedaily.com)
Most B vitamins are relatively small and have a fairly simple chemical structure, while vitamin B12 is larger and more complex. (whfoods.org)