Ledvina, Miroslav: Synthesis of 0-[2-acetamido-2-deoxy-6-0-stearoyl- and -6-0-(2-tetradecylhexadecanoyl)-beta-D-glucopyranosyl]-(1-->4)-N-acetylnormuramoyl-L-alpha-aminobutanoyl-D-isoglutamine, lipophilic disaccharide analogues of MDP