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FT-IR spectra of: (a) asphalt from ChGly-assisted toluene extraction, (b) asphalt from ChHis-assisted toluene extraction, (c) asphalt from ChSer-assisted toluene extraction, (d) asphalt from ChPro-assisted toluene extraction, (e) asphalt from ChPhe-assisted toluene extraction, and (f) asphalt from pure toluene extraction.
