All
 D03 Heterocyclic Compounds D006571 +
 D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
 D03.605.497 Morphinans D009019 +
 D03.605.497.575 Morphine D009020 +
 D03.605.497.575.547 Morphine Derivatives D009022 +
 D03.605.497.575.547.204 Codeine D003061 +
 D03.605.497.575.547.332 Heroin D003932 
 D03.605.497.575.547.420 Dihydromorphine D004090 
 D03.605.497.575.547.500 Hydromorphone D004091 
 D03.605.497.575.547.460 Ethylmorphine D005036 
 D03.605.497.575.547.851 Thebaine D013797