4-[4-(PIPERIDINOMETHYL)PYRIDYL-2-OXY]-CIS-2-BUTENAMINE(PREPARATION FOR LAFUTIDINE), 4-[4-(Piperidinomethyl)pyridyl; 4(E)-4-(4-(PIPERIDIN-1-YLMETHYL)PYRIDIN-2-YLOXY)BUT-2-EN-1-AMINE (INTERMEDIATE FOR LAFUTIDINE); 4-[4-(PIPERIDINOMETHYL)PYRIDYL-2-OXY]-CIS-2-BUTENAMINE(INTERMEDIATE FOR LAFUTIDINE); 4-(4-PIPERIDIN-1-YL-METHYL-PYRIDIN-2-YL-OXY)-BUT-2-ENYLAMINE; (Z)-4-(4-((Piperidin-1-yl)methyl)pyridin-2-yloxy)but-2-en-1-amine;