 <unk> is another compound that has more recently been isolated from European specimens of the fly agaric . It is a product of the breakdown of ibotenic acid by ultra @-@ violet radiation . <unk> is of minor <unk> activity compared with the other agents . Amanita muscaria and related species are known as effective <unk> of <unk> ; some species concentrate <unk> to levels of up to 400 times those typically found in plants . <unk> is present in fruit @-@ bodies as an <unk> compound called <unk> . The biological importance of the <unk> process is unknown . 
