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PMC 2666781
The peptide sequence Gly-His-Lys chelates a single Cu(II) ion through the histidine imidazole nitrogen and the deprotonated amide nitrogens of the backbone
The Information Technology and Innovation Foundation noted ahead of the vote that adding these compounds to the 503A list could legitimize a Chinese gray-market supply chain one in which several chemical firms previously involved in illegal fentanyl precursor production have pivoted into peptide sales while allowing potentially dangerous compounds into American medicine
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