Patent ID: 8361969

Claim:
A cyclic peptide, comprising the following sequence: cyclo(Ile-Ile-Xaa a -Xaa b -Lys-Xaa c -Xaa d -Gly-Xaa e -Xaa f -Xaa g -Asp-Phe-Asp)(SEQ ID NO:1) where: Xaa a =D-Asp Xaa b =D-Leu Xaa c =D-Tyr Xaa d =D-Glu Xaa e =D-Pro Xaa f =D-Biphenylalanine Xaa g =D-Asp; or a cyclic derivative (at least 93% sequence identity), in which any single amino acid is replaced by a chemical building block; wherein the peptide or derivative inhibits HIV-1 attachment to CD4-expressing cells.