1H-13C interactions found in the GHMBC spectrum provided additional evidence of aromatic carbons and substituent group interconnectivity. GNOESY provided the chiral carbon methine spatial interactions at 3.68 ppm with the methyl at 1.20 ppm for the "S" stereochemical designation. Similarly from above, the isopropyl resonances were less reliable due to correlations with several resonances and other empty parts of the spectrum. These spatial assignments helped to further support 3.5 Sonnet's answer of (S)-ibuprofen ethylester shown in 13, also referred in PubChem as Dexibuprofen Ethyl Ester .