1,2-Benzenedicarboxylic acid, mono(1-ethyl-1-methyl-2-propynyl) ester, sodium salt 16509-28-7 Ftalofyne sodium salt NSC25614 P 403 Phthalic acid, mono(1-ethyl-1-methyl-2-propynyl) ester, sodium salt Phthalofyne Phthalofyne sodium salt Whilcide Intravenous