... : 2-Phosphonobutane-1,2,4-tricarboxylic acid Cas:3 7971-36-1 Appearance: slightly yellow transparent liquid Product name:2-Phosphonobutane ... -1,2,4-tricarboxylic acidCas:37971-36-1Appearance:slightly yellow transparent liquidPhosphorous acid (as PO3): 0.5 ... plastic drum 2-Phosphonobutane-1,2,4-tricarboxylic acid/37971-36-1