3-Deoxyuridine-5-triphosphate trisodium (3-dUTP trisodium) is a nucleotide analogue that inhibits DNA-dependent RNA polymerases I and II. 3-Deoxyuridine-5-triphosphate trisodium strongly and competitively inhibits the incorporations of UTP into RNA with a Ki value of 2.0 µM[1].