7-(4-氧代-2-(对甲苯磺酰氧基)-4H-吡啶并[1,2-A]嘧啶-7-基)-4,7-二氮杂螺[2.5]辛烷-4-羧酸叔丁酯

4,7-Diazaspiro[2.5]octane-4-carboxylic acid, 7-[2-[[(4-methylphenyl)sulfonyl]oxy]-4-oxo-4H-pyrido[1,2-a]pyrimidin-7-yl]-, 1,1-dimethylethyl ester ·