c sub 4 h sub 9 str51 2 fuma rate 114 11536 n c sub 4 h sub 9 str52 2 hydro chlo ride 143 14437 c sub 2 h sub 5 str53 0 hydro chlo ride 97 9838 str54 str55 2 maleate 143 14439 str56 str57 2 hydro chlo ride 115 11640 str58 str59 2 hydro chlo ride 172 17441 str60 str61 2 hydro chlo ride 151 15242 str62 str63 2 hydro chlo ride 172 17443 n c sub 3 h sub 7 str64 1 fuma rate 118 11944 n c sub 3 h sub 7 str65 1 fuma rate 149 15045 str66 str67 1 free base 115 11646 n c sub 4 h sub 9 str68 2 hydro chlo ride 179 18047 str69 str70 2 maleate 103 10448 ch sub 3 str71 0 hydro chlo ride 160 16149 ch sub 3 str72 0 fuma rate 101 10250 ch sub 3 str73 0 hydro chlo ride 138 13951 ch sub 3 str74 0 hydro chlo ride 146 14952 ch sub 3 str75 0 hydro chlo ride 159 16053 ch sub 3 str76 0 hydro chlo ride 164 16554 c sub 2 h sub 5 str77 0 hydro chlo ride 125 12855 c sub 2 h sub 5 str78 0 fuma rate 91 93__________________________________________________________________________ in the compounds listed in table 1 the followings show excellent effects since the new compounds according to the present invention theoretically comprise two types of optical isomers because at least one asymmetric carbon atom is present in the molecule thereof this invention includes racemates and their optical isomers to be isolated therefrom the reaction of the compound represented by the general formula i with formaldehyde or paraformaldehyde and the compound represented by the general formula iii is preferably.