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Estrofem mite ® (3), 17-β-estradiol hemihydrate (2), and anhydrous 17-β-estradiol (1) 13C CP MAS NMR spectra. Solid state NMR analysis enabled to determine which form of 17-β-estradiol is present in the commercial dosage form, despite the low content of active pharmaceutical ingredient (API) (<5%). Source: author’s archive, more details in [38].
