Etodolac for peak identification

Resorcinol benzene-1,3-diol

Phthalic acid benzene-1,2-dicarboxylic acid

Fluorouracil impurity F - 2-ethoxy-5-fluoropyrimidin-4(1H)-one (2-ethoxy-5-fluorouracil)

Fluorouracil impurity C - pyrimidine-2,4(1H,3H)-dione (uracil)

Fluorouracil impurity B - dihydropyrimidine-2,4,5(3H)-trione (isobarbituric acid or 5-hydroxyuracil)

Fluorouracil impurity A - pyrimidine-2,4,6(1H,3H,5H)-trione (barbituric acid)

Vinpocetine impurity D - (12RS,13aRS,13bRS)-13a-ethyl-2,3,5,6,12,13,13a,13b-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate (dihydrovinpocetine)

Trimipramine for peak identification

Clozapine for peak identification