Ethoxyquin-(ethoxy-d5) is an isotope labeled analog of ethoxyquin - an antioxidant used as a protectant/post-harvest fungicide in animal feed as well as agricultural products, wherein the ethoxy protons are replaced by deuterium. Synonyms: 6-(Ethoxy-d5)-1,2-dihydro-2,2,4-trimethylquinoline;...