The IR and UV spectra of methyl indole-4-carboxylate was studied.Reactant for preparation of tryptophan dioxygenase inhibitors pyridyl-ethenyl-indoles as potential anticancer immunomodulators;Reactant for preparation of cytotoxic agents against multidrμg-resistant cancer cells;Reactant for preparation of inhibitor for β-tryptase;Reactant for preparation of histamine H3 antagonists;Reactant for preparation of JNK3 MAP kinase inhibitors;Reactant for preparation of nucleosides. The IR and UV spectra of methyl indole-4-carboxylate was studied. Reactant for preparation of tryptophan dioxygenase inhibitors pyridyl-ethenyl-indoles as potential anticancer immunomodulators;Reactant for preparation of cytotoxic agents against multidrug-resistant cancer cells;Reactant for preparation of inhibitor for β-tryptase;Reactant for preparation of histamine H3 antagonists;Reactant for preparation of JNK3 MAP kinase inhibitors;Reactant for preparation of nucleosides.