The molecule is a monocarboxylic acid anion that is the conjugate base of rigosertib, resulting from the deprotonation of the carboxy group. The major species at pH 7.3. It is a conjugate base of a rigosertib.
2-[2-methoxy-5-[[(E)-2-(2,4,6-trimethoxyphenyl)ethenyl]sulfonylmethyl]anilino]acetate