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Other HA derivativesThe disaccharideunit of HAfunctionalized withhydrazides.Photoreactive chromophores linked to HA for crosslinking:cinnamic acid (a), 1-carboxyalkyl substituteduracils (b), 7-carboxyalkoxyl-substituted coumarins(c), 1,2- O-ethanothymine (d), 1,2-O-ethano-5-trichloromethyluracil (e), 1,2-O-ethano-6-cyanouracil(f), 1,2-O-ethano-6- chloromethyluracil (g), and 1,2-Oethano-6-trichloromethyluracil30(h).