label: (4-carboxymethyl-7-(2-(carboxymethylamino)-3-(4-nitrophenyl)propyl)(1,4,7)triazonan-1-yl)acetic acid
label_lc: (4-carboxymethyl-7-(2-(carboxymethylamino)-3-(4-nitrophenyl)propyl)(1,4,7)triazonan-1-yl)acetic acid