Synonyms Choline Hydrogen Tartrate, Chemical Formula C9H19NO7, Molecular Weight 253.3, Appearance White crystalline substance; acidic taste. It is odourless or has a faint trimethylamine odour,Not less than 98.0% calculated on an anhydrous basis Assay ( As C9H19NO7, SolubilitySoluble in Water; the solution is clear & colourless.