FIELD: medicine.
SUBSTANCE: group of inventions refers to medicine and aims at treating attention deficit/hyperactivity syndrome (ADHD). The method of treating attention deficit/hyperactivity syndrome involves administering a therapeutically effective amount of a compound having formula 
, or its pharmaceutically acceptable salt into a mammal in need thereof, wherein R, R1 and R2 mean hydrogen and x=1. What is also provided is a pharmaceutical composition containing a compound having formula (1), or its pharmaceutically acceptable salt.
EFFECT: using the group of inventions provides the effective treatment of attention deficit/hyperactivity syndrome.
13 cl, 5 dwg, 3 tbl, 4 ex
