triphenylcarbenium ion

7-(β-D-2,3-O-isopropylidene-5-O-tritylribofuranosyl)-4-thioxo-3H-pyrazolo<1,5-a>-1,3,5-triazine

methyl 3,4-di-O-benzyl-2-O-methyl-6-O-trityl-α-D-galactopyranoside

methyl 2,3-di-O-benzyl-4-O-methyl-6-O-trityl-α-D-galactopyranoside

methyl 2,4-di-O-benzyl-3-O-methyl-6-O-trityl-α-D-galactopyranoside