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Ent-Oseltamivir Ent-Oseltamivir HCl Oseltamivir EP Impurity J (3S,4S,5R)-ethyl 4-acetamido (3S,4S,5R)-ethyl 4-acetamido-5-amino Oseltamivir EP Impurity J（Ent-Oseltamivir） Oseltamivir EP Impurity J HCl(Ent-Oseltamivir HCl) (3S, 4S, 5R) - 5-acetylamino-4-amino-3 - (pentane-3-oxy) cyclohexene-1-ethyl formate ethyl (3S,4S,5R)-4-acetamido-5-amino-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylate (3S,4S,5R)-4-acetylamino-5-amino-3-(1-ethylpropoxy)cyclohex-1-enecarboxylicacidethylester Oseltamivir Impurity 23Q: What is Oseltamivir Impurity 23 Q: What is the CAS Number of Oseltamivir Impurity 23