FIELD: chemistry.
SUBSTANCE: invention relates to a compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 are groups having the formulae shown below, and R2 is a 3-methyltetrahydro-2H-pyran-4-yl group or a 4-methoxycyclohexyl group. Disclosed compounds are PDE9 inhibitors. Invention also relates to particular compounds and a pharmaceutical composition comprising a compound of formula (III), or a pharmaceutically acceptable salt thereof.
R1: 
or 
or 
EFFECT: objects of the invention are agents for alleviating cognitive impairment in Alzheimer's disease and a method for alleviating said disorder.
13 cl, 1 dwg, 3 tbl, 4 ex
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