Provided is a compound represented by the following formula (I) or a pharmaceutically acceptable salt thereof:
[in the formula, R
1
to R
5
, A, and *1 to *3 are as defined in Description].
Drug drop off: Given that lysine‐specific demethylase 1 (LSD1) could be potently and selectively inactivated by delivering phenylcyclopropylamine (PCPA), a weak and nonselective LSD1 inhibitor, directly to the enzyme's active site, a novel series of LSD1 inactivators (1) were designed. Biological and mechanistic studies indicate that 1 inhibits LSD1 potently and selectively.