Psilocin analogs II. Synthesis of 3-[2-(dialkylamino)ethyl]-, 3-[2-(N-methyl-N-alkylamino)ethyl]-, and 3-[2-(cycloalkylamino)ethyl]indol-4-ols - Repke David B.; Ferguson Wilfred J.; Bates Dallas K. (Journal of Heterocyclic Chemistry, 1981)