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I'm having trouble understand what sections of the molecule morphine relate to what sections of its corresponding IUPAC name of (4R,4aR,7S,7aR,12bS)-3-methyl-2,4,4a,7,7a,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinoline-7,9-diol. One problem is I believe to have numbered the carbons in the correct order, although the name uses '12bS', which isn't included within my numbering.

Is anyone able to point me in the direction for learning how the name relates to the structure?

Here is my numbering of the chiral centres;

enter image description here

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  • $\begingroup$ I have a déjà-vu; I’m certain I added italics to the IUPAC name of morphine not too long ago … o.o $\endgroup$ – Jan Oct 15 at 4:59
  • $\begingroup$ @Jan OP decided to bump their question by deleting it and re-posting again. Sorry, no glitch in the matrix this time. $\endgroup$ – andselisk Oct 15 at 5:01
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    $\begingroup$ @andselisk That explains why I couldn’t find my old edit! $\endgroup$ – Jan Oct 15 at 5:03

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