1-Piperaz-COO(Bz), furan urethane deriv. 1-Piperazinecarboxylic acid, 3-[[(1,1-dimethylethyl)amino]carbonyl]-4-[(2R,3S)-2-hydroxy-4-phenyl-3-[[[(tetrahydro-3-furanyl)oxy]carbonyl]amino]butyl]-, phenylmethyl ester, (3S)- AIDS-032523 AIDS032523 L-735,524 analog