SYNTHESIS, STRUCTURE, AND PHYSICO-CHEMICAL PROPERTIES OF 3-METHYL AND 3,3-DIMETHYL DERIVATIVES OF L-(4′,4′-DIMETHYL-2′,6′-DIOXOCYCLOHEX-1′-YL)-3,4-DIHYDROISOQUINOLINE Article Davydov V.V., Sokol V.L., Balebanova E.V., Shklyaev Yu.V., Sergeev S.V., Nikanorov V.A., Zaitsev B.E., Porai-Koshits M.A. Russian Chemical Bulletin. Vol. 42. 1993. P. 288-294