AIDS-154141 AIDS154141 Ethyl (3S)-3-[(4S,1R,3R,5R)-7,7-dimethyl-4-(phenylmethoxy)-2,6,8-trioxabicyclo[3.3.0]oct-3-yl]-3-(butylamino)propanoate3-((3aR,5R,6S,6aR)-6-Benzyloxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-3-butylamino-propionic acid, ethyl ester