Promedol is a synthetic derivative of 4-phenylpiperidin and, by chemical structure, can be considered as an analogue of the phenyl-N-methylpiperidin part of morphine. Promedol is a mixture of optical isomers (including diastereomers) at positions 2, 4, and 5 of the piperidin cycle. Thus, the maximum possible number of isomers of promedol is eight. Six-membered heterocycle with one heteroatom is:

Promedol is a synthetic derivative of 4-phenylpiperidin and, by chemical structure, can be considered as an analogue of the phenyl-N-methylpiperidin part of morphine. Promedol is a mixture of optical isomers (including diastereomers) at positions 2, 4, and 5 of the piperidin cycle. Thus, the maximum possible number of isomers of promedol is eight. Six-membered heterocycle with one heteroatom is:

A. pyridine

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