: N 1927 (OTTO) 4-Nitrophenyl phosphate disodium salt, hexahydrate, 99%+ Cas 4264-83-9 - used to perform kinetic and endpoint determinations.N 1927 (OTTO) 4-Nitrophenyl phosphate disodium salt, hexahydrate, 99%+ Cas 4264-83-9 - used as a phosphorylating agent in nucleotide synthesis.