4-hydroxy-3-iodo-5-nitrobenzonitrile-13C6;4-Hydroxy-3-iodo-5-nitrobenzonitrile-13C6; 2-Iodo-4-cyano-6-nitrophenol-13C6; 3-Iodo-5-nitro-4-hydroxybenzonitrile-13C6; 3-Nitro-4-hydroxy-5-iodobenzonitrile-13C6; 3-Nitro-5-iodo-4-hydroxybenzonitrile-13C6; 4-Cyano-2-iodo-6-nitrophenol-13C6; Nitroxynil-13C6;Nitroxynil-13C6