diethyl 6-(3-(dimethylamino)-4-methylphenylamino)hexylphosphonate 、 violuric acid monohydrate 以The product is isolated by preparative HPLC (Method 1) as a red solid with 2.5%的产率得到diethyl 6-(8-(dimethylamino)-7-methyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl)hexylphosphonate