1. According to ring structure
A . Phenanthrene derivatives
Morphine
Codeine
Thebaine
B . Benzo-isoquinoline derivatives
Papaverine
Noscapine
11. According to synthesis
A. Natural opium alkaloids
Morphine
Codeine
B. Semi synthetic opium alkaloids
Heroine
Pholcodeine
C. Synthetic opiods
Pethidine
Methadine
Tramadol
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