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| Other names | Herchst 10495, NIH-7557 |
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| ECHA InfoCard | 100.008.383 |
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| Formula | C23H29NO |
| Molar mass | 335.491 g·mol−1 |
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Norpipanone (INN,BAN;Hexalgon) is anopioidanalgesic related tomethadone which was developed inGermany and distributed inHungary,Argentina, and other countries.[2][3] It had originally not been underinternational control but upon observation ofcase reports ofaddiction it was reviewed and shortly thereafter became acontrolled substance.[2][3] In the United States, it is a Schedule I controlled substance (ACSCN 9636, zero annual manufacturing quota as of 2014). The salts in use are the hydrobromide (free base conversion ratio 0.806) and hydrochloride (0.902).
