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The chemical degradation of lipiarmycin A3 and tiacumicin B allows assigning (18S,19R) absolute configuration. Reagents and conditions: (a) KOH aq.; (b) Ac2O, Py; (c) O3, MeOH/CH2Cl2, −78 °C; (d) NaBH4, from −78 °C to rt; (e) chromatographic separation; (f) Ac2O, Py, DMAP.
