left-to-right convention, 829 length, , 829 lethal concentration, 829 lethal dose, 830 lethal synthesis, 830 leuco bases, 830 leuco compounds [obsolete] , 830 leukotrienes, 831 level, 831 level width, , 831 levelling effect, 831
left-to-right convention, 829 length, , 829 lethal concentration, 829 lethal dose, 830 lethal synthesis, 830 leuco bases, 830 leuco compounds [obsolete] , 830 leukotrienes, 831 level, 831 level width, , 831 levelling effect, 831