AIDS-122299 AIDS122299 L-Valine, N-[(5-methyl-3-isoxazolyl)carbonyl]-, (1S)-2-[[(1S,2E)-4-ethoxy-4-oxo-1-[[(3S)-2-oxo-3-pyrrolidinyl]methyl]-2-butenyl]amino]-1-[(4-fluorophenyl)methyl]-2-oxoethyl ester