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ETHYL (2Z)-2-[(3-NITRO[1,1'-BIPHENYL]-4-YL)HYDRAZONO]-3-(4-NITROPHENYL)-3-OXOPROPANOATE ETHYL (2Z)-2-[(3-NITRO[1,1'-BIPHENYL]-4-YL)HYDRAZONO]-3-(4-NITROPHENYL)-3-OXOPROPANOATE