5-aminoindazole can be used as a drug molecule and organic synthesis intermediate, often participating as a basic skeleton in the construction of bioactive molecules such as HIV protease inhibitor 1- (3-aminoindazol-5-yl) -3-phenylmethyl-cyclic urea. The amino groups on the benzene ring can be diazotized and then converted into other active functional groups, such as halogen atoms, azide groups, etc., through diazonium salts.