4-(((R)-1-carboxy-1-(2,5-dioxopyrrolidin-1-yl)-2-(4-hydroxyphenyl)ethyl)((S)-1-carboxy-2-(4-hydroxyphenyl)ethyl)amino)-4-oxobutanoic acid
4-(((R)-1-carboxy-1-(2,5-dioxopyrrolidin-1-yl)-2-(4-hydroxyphenyl)ethyl)((S)-1-carboxy-2-(4-hydroxyphenyl)ethyl)amino)-4-oxobutanoic acid