Histamine dihydrochloride
Hexadecyltrimethylammonium bromide
hexachlorocyclohexane gamma-isomer
Homatropine Methylbromide
Hexahydrophthalic anhydride
hexahydro-1,3,5-triphenyl-1,3,5-triazine
Hydroquinone monobenzyl ether
Hydroquinone bis(2-hydroxyethyl)ether