<unk> , also known as<unk> um<unk> um and poppy<unk> , is a chemical substance found in certain plants of the Papaveraceae family (poppy) such as Papaver somniferum (opium poppy) and  and Papaver  bracteatum.<unk>  constitutes about 5% of opium and can be used as an analytical marker for the presence of opium.<unk>  has erroneously been described as a mild narcotic, but it has little or no physiological activity, and is not used medicinally.<unk>  forms salts with alkaloids and metals. These salts as well as<unk>  esters are called meconates.<unk>  was first isolated by Friedrich Sertürner in 1805.
Meconic acid
Hydrogen chloride
Cyanic acid
Meglutol
Ajmaline
Vinyl chloride
Vinyl ether
Oxamyl