Used primarily in research settings to study phosphodiesterase type 5 (PDE5) inhibition, this compound supports investigations into erectile dysfunction and pulmonary arterial hypertension. It serves as a reference standard in analytical testing and helps in understanding structure-activity relationships of tadalafil analogs. Due to its specific stereochemistry, it is valuable in comparative studies assessing the biological activity of different tadalafil isomers. Not intended for therapeutic use.