Formula (I) compounds are described:where the radicals are as defined in the description, processes for their preparation, and their uses for the preparation of conjugates with radionuclides for use in human and animal therapy and diagnostics, particularly for the diagnosis and therapy of pathological conditions such as tumours.本發明揭示一種式(I)化合物(其中基團係如說明書中所定義者)、製備彼之方法、及彼與放射性核素於製備用於人和動物之治療和診斷(特別是病症(諸如腫瘤)之診斷和治療)的共軛物上之用途。