Word: molecular
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Dates: during 1920-1929
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...Leonard began his experiments with carbolic acid, which, as is well known, kills disease germs and man with equal despatch. To resorcinol (very similar to carbolic acid) certain "fatty" acids were linked. The result was, at first, both an excellent antiseptic and a deadly poison. As the molecular proportion was changed, the antiseptic properties increased, the poisonous effect diminished. At last, with great difficulty, six atomical groups of the acids were united with the resorcinol, hexylresorcinol formed...