52851-58-8

1-Butyl-1,2-dihydro-4-hydroxy-2-oxo-3-quinolinecarboxylic Acid Ethyl Ester is an intermediate used in the synthesis of 1-Butyl-3-(1,1-dioxido-2H-1,2,4-benzothiadiazin-3-yl)-4-hydroxy-2(1H)-quinolinone (B691765), which is a heterocyclic inhibitor of the RNA-dependent RNA polymerase enzyme transcribed by the Hepatitis C virus.