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Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics This journal is © The Owner Societies 2013 Supplimentary Information Figure Legends: S1: Raman spectra of RNA building blocks and related compounds. All spectra are the average of 3 Raman spectra and have been baseline corrected, buffer subtracted and scaled to an effective 5 concentration of 50 mM. (a) Adenine related molecules: adenine (black), adenosine (red) and adenosine monophosphate (blue). The measured concentrations were 47.81 mM, 46.40 mM and 56.75 mM, respectively. (b) Cytosine related molecules: cytosine (black), cytidine (red) and cytidine monophosphate (blue). The measured concentrations were 47.70 mM, 56.74 mM and 55.38 mM, respectively. (c) Guanine related molecules: guanine (black), guanosine (red) and guanosine 10 monophosphate (blue). The measured concentrations were 46.19 mM, 63.90 mM and 46.67 mM, respectively. (d) Uracil related molecules: uracil (black), uridine (red) and uridine monophosphate (blue). The measured concentrations were 48.09 mM, 48.32 mM and 67.64 mM, respectively. (e) Ribose and phosphate molecules: ribose (black), ribose phosphate (red) and sodium phosphate (blue). The measured concentrations were 287.08 mM, 434.58 mM and 47.75 mM, respectively. 15 S2: Second derivative spectra of the measured RNA Raman spectra; SL-HIV1 (black), SL-APTR (red) and SL-SARS (blue). The positions of peaks discussed in the text are noted. Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics This journal is © The Owner Societies 2013 S1: a 6000 3000 Offset Y valuesY Offset AMP Adenosine Adenine 0 600 800 1000 1200 1400 1600 Raman shift (cm-1) b 6000 4000 2000 Offset Y valuesY Offset CMP Cytidine Cytosine 0 600 800 1000 1200 1400 1600 Raman shift (cm-1) Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics This journal is © The Owner Societies 2013 8000 c GMP Guanosine Guanine 6000 4000 Offset Y valuesY Offset 2000 0 600 800 1000 1200 1400 1600 Raman shift (cm-1) 12000 UMP d Uridine 10000 Uracil 8000 6000 4000 Offset Y valuesY Offset 2000 0 600 800 1000 1200 1400 1600 Raman shift (cm-1) Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics This journal is © The Owner Societies 2013 e Sodium phosphate D-Ribose 5-Phosphate D-Ribose 1800 900 Offset Y valuesY Offset 0 600 800 1000 1200 1400 1600 Raman Shift (cm-1) Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics This journal is © The Owner Societies 2013 Figure S2. SL-SARS SL-APTR SL-HIV1 400 840 1091 1264 1103 200 1103 0 Offset Raman intensityunits)(arb. Offset 840 1092 1102 1261 600 800 1000 1200 1400 1600 Raman Shift (cm-1) .