Synthesis of heptasaccharide and nonasaccharide analogues of the lentinan repeating unit

β-d-Glcp-(1→3)-β-d-Glcp-(1→3)-[β-d-Glcp-(1→6)]-β-d-Glcp-(1→3)-β-d-Glcp-(1→3)-[β-d-Glcp-(1→6)]-α-d-Glcp-1→OAll β-d-Glcp-(1→3)-{[β-d-Glcp-(1→6)]-β-d-Glcp-(1→3)-β-d-Glcp-(1→3)}2-[β-d-Glcp-(1→6)]-α-d-Glcp-1→O-acetonyl