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![31 P NMR spectra of the phosphonic acid 3 (162 MHz, [D6]DMSO, left) and](https://www.researchgate.net/profile/Joerg-Rademann/publication/320334373/figure/fig2/AS:553999372951554@1509095151549/P-NMR-spectra-of-the-phosphonic-acid-3-162-MHz-D6DMSO-left-and-the.png)


















