2-(3-(1-Piperidinyl)propanoyl)-1-(3-pyridinyl)-2,3,4,9-tetrahydro-1H-.beta.-carboline AIDS-134724 AIDS134724 NSC633406 {9H-Pyrido[3,4-b]indole,} {1,2,3,4-tetrahydro-2-[(1-oxo-3-} piperidin-1-yl)propyl\]-1-(3-pyridinyl)-