Synthesis of Hexp-(1→4)-β-D-GlcpNAc-(1→2)-α-D-Manp-(1→O)(CH2)7CH3 probes for exploration of the substrate specificity of glycosyltransferases: Part II, Hex = 3-O-methyl-β-D-Gal, 3-deoxy-β-D-Gal, 3-deoxy-3-fluoro-β-D-Gal, 3-amino-3-deoxy-β-D-Gal, β-D-Gul, α-L-Alt, or β-L-Gal