133752-35-9 Ece substrate Endothelin converting enzyme substrate Glyine, N-acetyl-L-histidyl-L-leucyl-L-alpha-aspartyl-L-isoleucyl-L-isoleucyl-L-tryptophyl-L-asparaginyl-L-threonyl-L-prolyl-N-(2-((5-sulfo-1-naphthalenyl)amino)ethyl)-L-glutaminyl-L-histidyl-