Abstract
Hasenbäumer gave a formula of C6H5⋅SbO3H2 for phenyl-stibonic acid. According to Schmidt, free stibonic acids are tri-acids composed of φ⋅SbO3H2, where φ stands for an aromatic nucleus. These formulae have been used customarily up to the present without any criticism but, it seems to the author that they are unreasonable. The author, therefore, offers a new formula, H[φ⋅Sb(OH)5] and its condensed form produced by dehydration, on the grounds of four reasons.
