O6,
O7-isopropylidene-
DL-
glycero-
DL-
allo-4,9;5,8-dianhydro-3-deoxy-[2]nonulosonic acid ethyl ester semicarbazone 在
sodium hydroxide 作用下,
生成
6-(O3,O4-isopropylidene-DL-glycero-DL-allo-1,6;2,5-dianhydro-heptitol-7-yl)-2H-[1,2,4]triazine-3,5-dione