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. 2025 Mar 9;88(3):877–888. doi: 10.1021/acs.jnatprod.4c01013

Figure 2.

Figure 2

Example of the common ABCD 1H spin system such as in aspirin (acetylsalicylic acid) exemplifies how specific NMR terminology connects visual observations (phenotype) with fundamental QM theory (genotype). The observed spectrum and its NMR parameters (blue) are compared to the calculated spectra (red).