3-(3-{2-[4-(2-Methoxy-phenyl)-piperazin-1-yl]-ethyl}-5-methyl-2,4-dioxo-3,4-dihydro-2H-thieno[3,4-d]pyrimidin-1-yl)-propionic acid 在
甲烷磺酸 、
sodium acetate 、 phosphorus pentoxide 作用下,
以
乙醇 为溶剂,
生成
4-{2-[4-(2-Methoxy-phenyl)-piperazin-1-yl]-ethyl}-2-methyl-6,7-dihydro-1-thia-4,5a-diaza-acenaphthylene-3,5,8-trione 8-(O-methyl-oxime)