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. Author manuscript; available in PMC: 2009 Nov 26.
Published in final edited form as: J Am Chem Soc. 2008 Nov 26;130(47):15814–15816. doi: 10.1021/ja804993y

Scheme 6.

Scheme 6

aKey: a) buffer at pH= 6.3–6.5 (6.0 M Gn•HCl, 188.8 mM Na2HPO4, 7.2 mM p-NO2PhOH), TCEP, 30 °C, 2–3h; b) buffer at pH= 6.3–6.5 (6.0 M Gn•HCl, 188.8 mM Na2HPO4, 18.8 mM TCEP•HCl), TCEP, VA-044, 37 °C, 2–3h.