Oseltamivir phosphate204255-11-8100 % similar Oseltamivir196618-13-088 % similar Ro 64-0802187227-45-866 % similar Ethyl (1S,5R,6S)-5-(1-ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylate204254-96-648 % similar Diethyl acetamidomalonate1068-90-233 % similar Ethyl 2-(acetylamino)-2-cyanoacetate4977-62-230 % similar