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A novel chiral methylpropargyl ester containing azobenzene moiety(S)-(-)-3-methyl-3-{4-[4-(n-octyloxy)phenylazophenyl]carbonyl}oxy-1-propyne 3(C25H30N2O3,Mr = 406.51) was synthesized and characterized by IR,NMR and single-crystal X-ray diffraction.The cry