Tokmajyan, G. STUDY OF BROMINATION REACTION OF 2,2,3,6,6-PENTAMETHYL-1,7-DIOXASPIRO[4,4]NONEN-3-ONE-8 AND THE SYNTHESIS OF NEW DERIVATIVES OF SPIROLACTONES ON THE BASE OF 3-BROMOMETHYL DERIVATIVE. Proc. YSU B: Chem. Biol. Sci. 2012, 46, 23-27.