acetyl­seryl­tyrosyl­seryl­iso­leucyl­threonyl­seryl­prolyl­seryl­glutaminyl­phenyl­alanyl­valyl­phenyl­alanyl­leucyl­seryl­seryl­valyl­tryptophyl­alanyl­aspartyl­prolyl­isoleucyl­glutamyl­leucyl­leucyl­asparaginyl­valyl­cysteinyl­threonyl­seryl­seryl­leucyl­glycyl­asparaginyl­glutaminyl­phenyl­alanyl­glutaminyl­threonyl­glutaminyl­glutaminyl­alanyl­arginyl­threonyl­threonyl­glutaminyl­valyl­glutaminyl­glutaminyl­phenyl­alanyl­seryl­glutaminyl­valyl­tryptophyl­lysyl­prolyl­phenyl­alanyl­prolyl­glutaminyl­seryl­threonyl­valyl­arginyl­phenyl­alanyl­prolyl­glycyl­aspartyl­valyl­tyrosyl­lysyl­valyl­tyrosyl­arginyl­tyrosyl­asparaginyl­alanyl­valyl­leucyl­aspartyl­prolyl­leucyl­isoleucyl­threonyl­alanyl­leucyl­leucyl­glycyl­threonyl­phenyl­alanyl­aspartyl­threonyl­arginyl­asparaginyl­arginyl­isoleucyl­isoleucyl­glutamyl­valyl­glutamyl­asparaginyl­glutaminyl­glutaminyl­seryl­prolyl­threonyl­threonyl­alanyl­glutamyl­threonyl­leucyl­aspartyl­alanyl­threonyl­arginyl­arginyl­valyl­aspartyl­aspartyl­alanyl­threonyl­valyl­alanyl­isoleucyl­arginyl­seryl­alanyl­asparaginyl­isoleucyl­asparaginyl­leucyl­valyl­asparaginyl­glutamyl­leucyl­valyl­arginyl­glycyl­threonyl­glycyl­leucyl­tyrosyl­asparaginyl­glutaminyl­asparaginyl­threonyl­phenyl­alanyl­glutamyl­seryl­methionyl­seryl­glycyl­leucyl­valyl­tryptophyl­threonyl­seryl­alanyl­prolyl­alanyl­serine.

Just in case you were wondering, that's pretty much the longest word ever. You're welcome.