![17-(Ethynyl-13C2)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-19-norpregna-1,3,5(10)-trien-20-yn-17-ol](https://structures.clearsynth.com/CS-T-102385.JPG)
17-(Ethynyl-13C2)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-19-norpregna-1,3,5(10)-trien-20-yn-17-ol,17-(Ethynyl-13C2)-3-[(tetrahydro-2H-pyran-2-yl)oxy]-19-norpregna-1,3,5(10)-trien-20-yn-17-ol,- Stable Isotopes
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