157553-92-9 2-(Trimethylsilyl)ethyl 4-O-(3-O-(beta-D-galactopyranosyl)-alpha-D-galactopyranosyl)-beta-D-galactopyranoside 2-(Trimethylsilyl)ethyl 4-O-(3-O-(galactopyranosyl)galactopyranosyl)galactopyranoside Tmse-ggg