6-Oxoheptanoic acid is a monocarboxylic acid with acyl functional group. Mass spectrometric characterization of 6-oxoheptanoic acid by electrospray ionization coupled to a triple quadrupole and TOF analyzer hybrid system has been reported.6-Oxoheptanoic acid may be used in the following studies: · As ketone linker used for the conjμgation of hydrazide derivatives to proteins. · Synthesis of N-(2-propynyl)-6-oxoheptanamide. · Synthesis of adenosine triphosphate derivative. 6-Oxoheptanoic acid is a monocarboxylic acid with acyl functional group. Mass spectrometric characterization of 6-oxoheptanoic acid by electrospray ionization coupled to a triple quadrupole and TOF analyzer hybrid system has been reported.