A process for the preparation of 1,3a,8-trimethyl-1,2,3,3a,8, 8a- hexahydro-pyrrole[2,3-b]indol-5(3aS,8aR)-hep tylcarbamate, of formula (I) ##STR1## by reacting eseroline with heptylisocyanate in the presence of a metal cyanate and of a quaternary ammonium salt, in polar aprotic solvents.
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