Reactant for preparation of (-)- and (+)-debromoflustramine B and its analogues as selective butyrylcholinesterase inhibitors Reactant for preparation of carboline analogs as potent MAPKAP-K2 inhibitors Reactant for preparation of indole-N-acetic acid derivatives as aldose reductase inhibitors for diabetic complications treatment Reactant for preparation of debromoflustramine B and labeled Me(3a)-13C-physostigmine Reactant for preparation of physostigmine and physovenine Reactant for preparation of phenethyl substituted indole derivatives as melatoninergic agonists and antagonists