S-[2-(Iodo-4-azidosalicylamido)ethylthio]-2-thiopyridine

IAET is a cleavable, photoactivable cross linking agent. The maximum length of the linker arm between Ca of the amino acid of interest and the photoreactive atom is 14A. The IAET absorbance maxima are: l max = 273nm; e= 2.3 x 104 ; l max = 343nm; e=8.0 x 103