CAS :204254-96-6 it's the intermediate of Oseltamiv that is used as ... intermediate of Oseltamivir that is used as Flu as APICAS :204254-96-6(1S,5R,6S)-Ethyl 5-(pentan-3-yl-oxy)-7 ... -3-carboxylic acid ethyl esterFormula:C14H22O4Formula weight:254.33CAS Number:204254-96-6 CAS :204254-96-6,(1S,5R,6S)-Ethyl 5-(pentan-3-yl-oxy)-7 ...