(4R)-3-((2S,3S)-3-{[(2,6-Dimethylphenoxy)acetyl]amino}-2-hydroxy-4-phenylbutanoyl)-5,5-dimethyl-N-[(1S)-1,2,3,4-tetrahydronaphthalen-1-yl]-1,3-thiazolidine-4-carboxamide AIDS-190421 AIDS190421