Gravar-mail: Stereospecific Synthesis of Methyl 2-Amino-2-deoxy-(6S)-deuterio-α,β-D-glucopyranoside and Methyl 2,6-Diamino-2,6-dideoxy-(6R)-deuterio-α,β-D-glucopyranoside: Side Chain Conformations of the 2-Amino-2-deoxy and 2,6-Diamino-2,6-Dideoxyglucopyranosides