1-Piperazineacetic Acid 2-[[2-Hydroxy-3-(2-propen-1-yl)phenyl]methylene]hydrazide-d8 is deuterium labelled 1-Piperazineacetic Acid 2-[[2-Hydroxy-3-(2-propen-1-yl)phenyl]methylene]hydrazide (H953060) and has been employed to characterize the in vivo and in vitro metabolic profile of PAC-1 (P132000), an anti-tumor agent that induces apoptosis.