Triphosphoric acid,P-[[(1S,2R,3S,4R,5S)-4-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-2,3-dihydroxybicyclo[3.1.0]hex-1-yl]methyl] ester, compd. withN,N-diethylethanamine (1:1)