... -4-one, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-M.F. & M.W.: C15H10O7, 302.23Physical Property: yellow needle like crystal ... (dihydrate in dilute ethanol); dehydrate at 95-97; M.P.: 314 (dissociate); solubility: 1g in 290ml anhydrous ethanol, or 23ml ...