| id | String | No description |
| meta | Meta | No description |
| implicitRules | uri | No description |
| _implicitRules | ElementBase | No description |
| language | code | No description |
| _language | ElementBase | No description |
| text | Narrative | No description |
| contained | [Resource] | No description |
| extension | [Extension] | No description |
| modifierExtension | [Extension] | No description |
| identifier | Identifier | No description |
| type | CodeableConcept | No description |
| status | CodeableConcept | No description |
| domain | CodeableConcept | No description |
| description | String | No description |
| _description | ElementBase | No description |
| source | [Reference] | No description |
| comment | String | No description |
| _comment | ElementBase | No description |
| moiety | [SubstanceSpecificationMoiety] | No description |
| property | [SubstanceSpecificationProperty] | No description |
| referenceInformation | Reference | No description |
| structure | SubstanceSpecificationStructure | No description |
| code | [SubstanceSpecificationCode] | No description |
| name | [SubstanceSpecificationName] | No description |
| molecularWeight | [SubstanceSpecificationStructureIsotopeMolecularWeight] | No description |
| relationship | [SubstanceSpecificationRelationship] | No description |
| nucleicAcid | Reference | No description |
| polymer | Reference | No description |
| protein | Reference | No description |
| sourceMaterial | Reference | No description |