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visible uv absorption spectrum of polyenes alkenes carotene buta-1,3-diene hexa-1,3,5-triene octa-1,3,5,7-tetraene deca-1,3,5,7,9-pentaene astaxanthin spectra maximum ultraviolet absorption peaks wavelength Doc Brown's chemistry revision notes
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uv-visible absorption spectrum of methylene blue dye peak wavelengths of maximum absorbance uses staining dye treatment of methemoglobinemia redox titration indicator molecular structure skeletal formulae example of aromatic spectra Doc Brown's chemistry
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