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Portable Network Graphic  |  2001-04-27  |  875 b   |  228x60  |  1-bit (2 colors)
   ocr: 2247 cm-CEN stretch. Normal range: 2250+10 cm-1, - - - lowered 0-20 cm-1 when conjugated. Compare to the C=C stretch in 1-heptyne (2119cm-1).