This is a product of the European Pharmacopoeia. Solubility information is not provided by the supplier. However, the research grade product C0768 is the same compound and the solubility information may be applied to the EP standard. The compound is soluble in water at 40mg/mL. Please see the following link for the product information : https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/268/329/c0768pis.pdf
Please see this link to contact EP directly:
https://crs.edqm.eu/db/4DCGI/View=C3250000