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Chemical Shifts (ppm) of the 5′-Cp-N2-dG-3′-R-(α)-CH3-Propyl-5′-Cp-N2-dG-3′ and 5′-Cp-N2-dG-3′- S-(α)-CH3-Propyl-5′-Cp-N2-dG-3′ Inter-strand DNA Cross-links 8a and 8b.