In molecular biology and pharmacology, a small molecule is a low molecular weight (<900 daltons) organic compound that may help regulate a biological process, with a size on the order of 6991100000000000000♠10−9 m. Most drugs are small molecules.The upper molecular weight limit for a small molecule is approximately 900 daltons, which allows for the possibility to rapidly diffuse across cell membranes so that they can reach intracellular sites of action.
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