 Stirring an alcoholic solution of megaphone (megaphone acetate), with added palladium catalyst, in hydrogen atmosphere, followed by evaporation of the solvent yields tetrahydromegaphone (tetrahydromegaphone acetate) as an oil.Millimeter-sized crystals of megaphone can be grown from an ether-chloroform solution.They have monoclinic symmetry with space group "P"21, lattice constants "a" = 0.8757 nm, "b" = 1.1942 nm and "c" = 1.0177 nm and two formula units per unit cell.