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Combined Liquid Chromatography–Tandem Mass Spectrometry Analysis of Progesterone Metabolites

Fig 2

Reaction scheme and structural formulae of the pregn-4-ene-metabolites.

Reagents and conditions: (a) Al(O-i-Pr)3, 2-propanol, reflux.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0117984.g002