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![Oseltamivir impurity 4; (1R,5S,6R)-ethyl 5-(pentan-3-yloxy)-7-oxa[4.1.0]hept-3-ene-3-carboxylate](/upload/image/thumb/2_600_600_20250318202503181048.jpg)
Fmoc-Lys(Boc)-OH
