Try this at home
Returning to the DQF-COSY of taxole, I have found this challenge:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1wo6rebj3kWPiaNtjg6lWSyq_JcQxZx4RnDys2T_WrAG_g8vdxzlrupSJUbt5juv8rQ2RLBCm0nIBO5BsefUaZ8-MXbQpDLfrvRrgVdNAVqip7qgjMi3Kp5wdcWs7jhQpcmH7kA/s400/challenge.png)
I couldn't tell which kind of multiplet it was. I have extracted the section corresponding to the red line and moved it into my novel simulator. Then I have introduced 3 couplings and pushed the "Fit" button.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgO0q-LeEKGSfh4K9TT0tGH-nUfB5zOcY9_uOQKQHY8cO1z20jvgWKfJGf-NxwEAWXmbPyakyeNAYFOE42ksKjpxZnmFl2AWOGgXzVY83Iuer8Zdwv9H-BdtVSr-ORi8gSp5XpYuw/s400/solution.png)
That's all. The goodness of the fit is convincing. It is a doublet of doublets of doublets and the Js are: 14.7, 6.4 and 9.9 Hz. The latter corresponds to an antiphase coupling. Not only I know which kind of multiplet it is, I have also measured the Js!
You might feel it's funny, I find it amazing, perhaps somebody will say it is useful. "The coupling constants were extracted from the DQF-COSY by the blogger's simulator".
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