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The C\u201014 label was located in the carbon connecting the A and B ring with a propionic acid side chain on both the C and D ring and alkyl substitution on the remaining positions of the pyrrole rings of the heme. The synthesis was achieved in 7 radiochemical steps and 11% radiochemical yield from\n                    <jats:sup>14<\/jats:sup>\n                    C\u2010formaldehyde. 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