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Lapachol acetate [systematic name: 3-(3-methyl-but-2-en-yl)-1,4-dioxonaph-thalen-2-yl acetate], C 17 H 16 O 4 , was prepared using a modified high-yield procedure and its crystal structure is reported for the first time 80 years after its first synthesis. The full spectroscopic characterization of the mol-ecule is reported. The mol-ecular conformation shows little difference with other lapachol derivatives and lapachol itself. The packing is directed by inter-molecular π-π and C-H⋯O inter-actions, as described by Hirshfeld surface analysis. The former inter-actions make the largest contributions to the total packing energy in a ratio of 2:1 with respect to the latter.

Crystal structure and Hirshfeld surface analysis of lapachol acetate 80 years after its first synthesis