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Morphine has five rings.
Each ring has been assigned with a letter (A, B, C, D and E).
Ring A, aromatic ring
Ring B, cyclohexane ring
Ring C, cyclohexen ring
Ring D, piperidine ring
Ring E, tetrahydrofuran ring
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Each atom has been assigned a number. Each structure shows a ring, and the numbers assigned to each atom in that ring.
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(-)-Morphine has 5 chiral carbons:
5R, 6S, 9R, 13S, and 14R