2-[[6-[Bis(2-Hydroxyethyl)amino]-4,8-di-1-piperidinylpyrimido[5,4-d]pyrimidin-2-yl](2-hydroxyethyl)amino]ethyl b-D-glucopyranosiduronic Acid

2-[[6-[Bis(2-Hydroxyethyl)amino]-4,8-di-1-piperidinylpyrimido[5,4-d]pyrimidin-2-yl](2-hydroxyethyl)amino]ethyl b-D-glucopyranosiduronic Acid ·