| id | String | No description |
| extension | [Extension] | No description |
| modifierExtension | [Extension] | No description |
| stereochemistry | CodeableConcept | No description |
| opticalActivity | CodeableConcept | No description |
| molecularFormula | String | No description |
| _molecularFormula | ElementBase | No description |
| molecularFormulaByMoiety | String | No description |
| _molecularFormulaByMoiety | ElementBase | No description |
| isotope | [SubstanceSpecificationStructureIsotope] | No description |
| molecularWeight | SubstanceSpecificationStructureIsotopeMolecularWeight | No description |
| source | [Reference] | No description |
| representation | [SubstanceSpecificationStructureRepresentation] | No description |