2,4-Dinitrophenylhydrazine-13C6;(2,4-Dinitrophenyl-13C6)hydrazine;(2,4-Dinitrophenyl-1,2,3,4,5,6-13C6)hydrazine;"2,4-Dinitrophenylhydrazine 13C6, with Water";2,4-Dinitrophenylhydrazine-13C6, Stabilized with Water;(2,4-dinitro(1,2,3,4,5,6-^{13}C_{6})cyclohexa-1,3,5-trien-1-yl)hydrazine
2,4-Dinitrophenylhydrazine-13C6 is a novel isotope-labeled dinitrophenylhydrazines (DNPHs) and methods for their use in detecting and/or quantifying carbonyl groups in proteins and other analytes.