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NA and NR spanish.svg Structures of salvageable forms of the NAD precursors nicotinic acid nicotinamide and nicotinamide riboside Created using acdlabs html ACD and Inkscape NA NandNR svg UTC NA NandNR svg Fvasconcellos December UTC Image NA and NR by Tim Vickers derivative work Gustavocarra talk NA NandNR svg nicotinamide