â-D-Allofuranuronic acid,5-[[(2S,3S,4S)-2-amino-4-hydroxy-4- (5-hydroxy-2-pyridinyl)-3-methyl-1- oxobutyl]amino]-1,5-dideoxy-1-(3,4-dihydro- 5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-