methyl 3-methyl-4-[4-[2-[6-(methylamino)pyridin-2-yl]-1-ethoxy]phenyl]-3-butenoate 、 Ethyl (+/-)-3-phenyl-4-[4-[2-[6-(methylamino)pyridin-2-yl]-1-ethoxy]pheny]butanoate 以the title compound (30 mg) was obtained as a yellow foam的产率得到3-methyl-4-[4-[2-[6-(methylamino)pyridin-2-yl]-1-ethoxy]phenyl]-3-butenoic acid