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Electronic Supporting Information I. Experimental Methods Chemicals and Methods 4-Thiothymidine (4-thioThd, 99% purity) was obtained from Carbosynth Limited, Berkshire, UK and used as received. 1-butyl-1-methylpyrrolidium bis(trifluoromethylsulfonyl) imide, [BMPyrr][NTf 2 ], was obtained from Sigma-Aldrich (≥ 98.0% purity and ≤ 0.2% water content). Acetonitrile (99.9%) was bought from Fisher Scientific. Steady-state absorption and emission spectra were measured at room temperature using a Carydoi:10.1039/c0cc01181a pmid:20617255 fatcat:oiury5d5bnfrvi4yaqyphg5usm