Periodic Table Database Schema - v0.6.3
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    RegistryGroup: Group<
        {
            atc?: Distinct<ATCCode[]>;
            beilstein?: Distinct<BeilsteinNumber>;
            cas?: Distinct<CASNumber>;
            chebi?: Distinct<ChEBIID>;
            chembl?: Distinct<ChEMBLID>;
            chemspider?: Distinct<ChemSpiderID>;
            cid?: Distinct<PubChemCID>;
            drugbank?: Distinct<DrugBankID>;
            ec?: Distinct<ECNumber>;
            echa?: Distinct<ECHAInfoCard>;
            einecs?: Distinct<ECNumber>;
            elincs?: Distinct<ECNumber>;
            gmelin?: Distinct<GmelinNumber>;
            kegg?: Distinct<KEGGID>;
            nsc?: Distinct<NSCNumber>;
            pdb?: Distinct<PDBID[]>;
            rtecs?: Distinct<RTECSNumber>;
            unii?: Distinct<UNII>;
            wikidata?: Distinct<WikidataID>;
        },
    >

    Registry of identifiers for cross-referencing external scientific databases.