BK-MAPB, also known as β-keto-MAPB, is a synthetic compound within the benzofuran and cathinone chemical classes. It is the β-keto analogue of MAPB and is structurally related to other benzofuran-based phenethylamines. Due to this structural profile, BK-MAPB is primarily referenced in analytical chemistry, forensic toxicology, and pharmacological research.

The defining β-keto functional group places BK-MAPB within the cathinone subclass, which is known to influence metabolic behavior and physicochemical properties when compared to non-keto analogues. In scientific literature, BK-MAPB is commonly discussed in structure–activity relationship (SAR) studies and comparative analyses involving monoamine-active compounds. Its relevance is largely academic, supporting chemical identification, reference standard development, and compound classification efforts.

In laboratory settings, BK-MAPB typically appears as a white to off-white crystalline powder and is often encountered in salt form to enhance stability and reproducibility during testing. BK-MAPB has no approved medical or therapeutic use, and its legal status varies internationally. As such, it is most frequently mentioned in chemical databases, monitoring reports, and peer-reviewed research rather than applied contexts.