1-Cyclohexene-1-carboxylic acid, 4-(acetylamino)-5-amino-3-(1-ethylpropoxy)-, (3R,4R,5S)- 1-Cyclohexene-1-carboxylic acid, 4-(acetylamino)-5-amino-3-(1-ethylpropoxy)-, (3R-(3alpha,4beta,5alpha))- 187227-45-8 GS 4071 Oseltamivir acid Oseltamivir carboxylate Ro 64-0802