Specifications:Ultra Pure GradeEm (258nm phosphate buffer pH 7.0): >11,000Em (Anhydrous, 258nm): >14,500Heavy metals (as Pb): <0.002%A250/A260: 0.79-0.81A280/A260: 0.18-0.22Appearance: SolidChEBI : Not available.Crystal_Structure : Not available.InChI : Not available.InChIKey : Not available.