http://hl7.org/fhir/StructureDefinition/SubstanceNucleicAcid|4.0.1

Nucleic acids are defined by three distinct elements: the base, sugar and linkage. Individual substance/moiety IDs will be created for each of these elements. The nucleotide sequence will be always entered in the 5’-3’ direction.
element_idtypes
SubstanceNucleicAcid
SubstanceNucleicAcid.sequenceType
SubstanceNucleicAcid.numberOfSubunits
SubstanceNucleicAcid.areaOfHybridisation
SubstanceNucleicAcid.oligoNucleotideType
SubstanceNucleicAcid.subunit
SubstanceNucleicAcid.subunit.subunit
SubstanceNucleicAcid.subunit.sequence
SubstanceNucleicAcid.subunit.length
SubstanceNucleicAcid.subunit.sequenceAttachment
SubstanceNucleicAcid.subunit.fivePrime
SubstanceNucleicAcid.subunit.threePrime
SubstanceNucleicAcid.subunit.linkage
SubstanceNucleicAcid.subunit.linkage.connectivity
SubstanceNucleicAcid.subunit.linkage.identifier
SubstanceNucleicAcid.subunit.linkage.name
SubstanceNucleicAcid.subunit.linkage.residueSite
SubstanceNucleicAcid.subunit.sugar
SubstanceNucleicAcid.subunit.sugar.identifier
SubstanceNucleicAcid.subunit.sugar.name
SubstanceNucleicAcid.subunit.sugar.residueSite
SubstanceNucleicAcid
SubstanceNucleicAcid.id
SubstanceNucleicAcid.meta
SubstanceNucleicAcid.implicitRules
SubstanceNucleicAcid.language
SubstanceNucleicAcid.text
SubstanceNucleicAcid.contained
SubstanceNucleicAcid.extension
SubstanceNucleicAcid.modifierExtension
SubstanceNucleicAcid.sequenceType
SubstanceNucleicAcid.numberOfSubunits
SubstanceNucleicAcid.areaOfHybridisation
SubstanceNucleicAcid.oligoNucleotideType
SubstanceNucleicAcid.subunit
SubstanceNucleicAcid.subunit.id
SubstanceNucleicAcid.subunit.extension
SubstanceNucleicAcid.subunit.modifierExtension
SubstanceNucleicAcid.subunit.subunit
SubstanceNucleicAcid.subunit.sequence
SubstanceNucleicAcid.subunit.length
SubstanceNucleicAcid.subunit.sequenceAttachment
SubstanceNucleicAcid.subunit.fivePrime
SubstanceNucleicAcid.subunit.threePrime
SubstanceNucleicAcid.subunit.linkage
SubstanceNucleicAcid.subunit.linkage.id
SubstanceNucleicAcid.subunit.linkage.extension
SubstanceNucleicAcid.subunit.linkage.modifierExtension
SubstanceNucleicAcid.subunit.linkage.connectivity
SubstanceNucleicAcid.subunit.linkage.identifier
SubstanceNucleicAcid.subunit.linkage.name
SubstanceNucleicAcid.subunit.linkage.residueSite
SubstanceNucleicAcid.subunit.sugar
SubstanceNucleicAcid.subunit.sugar.id
SubstanceNucleicAcid.subunit.sugar.extension
SubstanceNucleicAcid.subunit.sugar.modifierExtension
SubstanceNucleicAcid.subunit.sugar.identifier
SubstanceNucleicAcid.subunit.sugar.name
SubstanceNucleicAcid.subunit.sugar.residueSite