1-Acetylpyrene is a pyrene derivative. Its synthesis has been reported. Its phytophysical properties have been studied using absolute fluorescence quantum yield measurement and time-dependent density functional theory (TD-DFT) calculations. Its ability to interact with human cytochromes P450 2A13, 2A6, and 1B1 and enzyme inhibition has been reported. Its function as an environment-sensitive fluorophore has been investigated.