4-(4-PIPERIDIN-1-YL-METHYL-PYRIDIN-2-YL-OXY)-BUT-2-ENYLAMINE; 4-[4-(PIPERIDINOMETHYL)PYRIDYL-2-OXY]-CIS-2-BUTENAMINE(INTERMEDIATE FOR LAFUTIDINE); 4-[4-(Piperidinomethyl)pyridyl; 4-[4-(PIPERIDINOMETHYL)PYRIDYL-2-OXY]-CIS-2-BUTENAMINE(PREPARATION FOR LAFUTIDINE); 4(E)-4-(4-(PIPERIDIN-1-YLMETHYL)PYRIDIN-2-YLOXY)BUT-2-EN-1-AMINE (INTERMEDIATE FOR LAFUTIDINE); (2E)-4-{[4-(piperidin-1-ylmethyl)pyridin-2-yl]oxy}but-2-en-1-amine