5[R-.PSI.(CH2N)PK]-TASP AIDS-111801 AIDS111801 Lys[-(Lys-Pro.psi.(CH2N)-Arg-NH2)2]-Lys[-Lys-Pro.psi.(CH2N)-Arg-NH2]-Lys[-Lys-Pro.psi.(CH2N)-Arg-NH2]-Lys[-Lys-Pro-psi.(CH2N)-Arg-NH2]-Gly-Cys-OH Pseudopeptides