139346-17-1 BQ 153 BQ-153 Cyclo(3-sulfo-D-alanyl-L-prolyl-D-valyl-L-leucyl-D-tryptophyl) Cyclo(D-sal-L-pro-D-val-L-leu-D-trp-) Cyclo(sal-pro-val-leu-trp-) Cyclo(sulfoalanyl-prolyl-valyl-leucyl-tryptophyl) c(D-Trp-D-cys(SO3-Na+)-pro-D-val-leu)