Hyaluronicacidisamacromolecularg unitcontainingN‐acetylglucosamineandglucuronicac ﹒ Itexistsintissuesofmostanimals ﹒ Its sodiumsalt,sodiumhyaluronate(SH),isusuallyusedinclinic ﹒ Asadrugvehicle,SHhasbeen usedinmanydrugs。 ......