Answer:
Conversion of codeine into morphine in the liver by CYP2D6.
Explanation:
Morphine is a chemical compound that is used as medication for the treatment of pain. The medication has the chemical formula of C₁₇H₁₉NO₃, Molar mass of 285.34 g/mol, Melting point of 255 °C and the Boiling point of 254 °C.
Just like it is given in the question above that is " the phenol group of morphine is important in binding morphine to opioid receptors and causing analgesia".
MAIN ANSWER:
So, when one uses Codeine, there is going to be the transformation when it gets to the liver that is the Codeine will be turned to a morphine through the help of the enzyme known as CYP2D6.