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PBTC 2-Phosphonobutane -1 2 4-Tricarboxylic Acid CAS 37971-36-1,Antiscalants Corrosion Inhibitors And Chelating Agentslink:http://www.yingxinwater.com/antiscalants-corrosion-inhibitors-and-chelating-ag/pbtc-2-phosphonobutane-1-2-4-tricarboxylic.html