... pale yellow aqueous soluti 2-Phosphonobutane -1,2,4-Tricarboxylic Acid(PBTCA)CAS No. 37971-36-1Molecular Formula: ... has structural features of both phosphoric acid and carboxylic acid group, which enable its excellent scale ... ;PHOSPHONOBUTANE TRICARBOXYLIC ACID;2-Phosphonobutane -1,2,4-Tricarboxylic Acid;2-Phosphonobutane-1,2,4-tricarboxylic acid PBTC; 2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTCA ...