2-甲基烟酸 、 1-Ethyl-3-(4-(4-morpholino-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-yl)phenyl)urea hydrochloride salt 以The desired product oy (74 mg, 58% yield) was obtained as white solid的产率得到1-ethyl-3-(4-(7-(2-methylnicotinoyl)-4-morpholino-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-yl)phenyl)urea