The volatile organic compounds (VOCs) produced by decomposing tissue and organs were studied in an effort to identify possible human-specific markers (PLoS ONE 2015 10(9): e0137341.). Of 452 VOCs isolated, six were found to be unique to humans, so this may prove to be a useful tool for forensic chemists trying to determine the source of unidentified remains. There are two doublets in the expected 1H NMR spectrum of the following human-specific VOC. Identify the protons giving rise to each doublet. Identify the two groups of protons that are associated with the two doublets in the spectrum (enter the numbers in ascending order): and