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Chemical structure of verbascoside and leucosceptoside A (A); Total correlation spectroscopy (1H-1H TOCSY) and NMR spectra of H. procumbens (HP) cell suspension extract (B), the aromatic part of the spectra (C); 1H-1H homonuclear correlation spectroscopy (COSY) NMR spectra of HP cell suspension extract (D) and 1H-13C HSQC NMR signals (E).
