A compound that is (1r, 1'R, 4R) -4-methoxy-5 '' - methyl-6 '- [5- (prop-1-in-1-yl) pyridin-3-yl] -3' H-diespiro [cyclohexane-1,2'-indene-1 ', 2' '-imidazole] -4' '-amine: ** Formula ** or a pharmaceutically acceptable salt thereof.Un compuesto que es (1r,1'R,4R)-4-metoxi-5''-metil-6'-[5-(prop-1-in-1-il)piridin-3-il]-3'H-diespiro[ciclohexano-1,2'- indeno-1',2''-imidazol]-4''-amina:**Fórmula** o una sal farmacéuticamente aceptable de esto.