Tags: Chemical Compound, Chemical Substance.

BQ-123 is a cyclic peptide consisting of five amino acids. The amino acid sequence is D-tryptamine-D-aspartic acid-L-proline-D-valine-L-leucine.BQ-123 is a selective ETA endothelin receptor antagonist. As such it is used as a biochemical tool in the study of endothelin receptor function.

BQ-123_structure.svg
IUPAC name
2-[(3R6R9S12R15S)-6-(1H-indol-3-ylmethyl)-9-(2-methylpropyl)-2581114-pentaoxo-12-propan-2-yl-1471013-pentazabicyclo[13.3.0]octadecan-3-yl]acetic acid

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