Isolation and characterization of the major equilibrium product of FK-520
F P Gailliot1, T K Natishan, J M Ballard
1Merck Research Laboratories, Rahway, NJ 07065-0900.
Abstract:
The existence of an isomeric form in equilibrium with the major component of FK-520 in polar solutions has been demonstrated. This minor component has been isolated in high yield and purity by a novel crystallization strategy and preparative HPLC. The equilibrium product was characterized by NMR and MS.
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