Etodolac hydrazide and a novel series of etodolac hydrazide‐hydrazones 3–15 and etodolac 4‐thiazolidinones 16–26 were synthesized in this study. The structures of the new compounds were determined by spectral (FT‐IR, 1H NMR, 13C NMR, HREI‐MS) methods. Some selected compounds were determined at one dose toward the full panel of 60 human cancer cell lines by the National Cancer Institute (NCI, Bethesda