(o)二糖的B连接 CH,CH CH,OH 纤维二糖 B-D-glucopyranosyl (1→4)B-D-毗特（型）葡萄糖 H OH H B-D-Gl B-D-Gle 乳帮 D-萄萄糖 B-D-galactopyranosy 1→4)B-0-毗情（型）葡萄糖 OH H H OH H OH B-D-Gal B-D-Gle 龙思二 CH,CH 0 B-D-glucopyranosyl (1→)B-D-毗腩型)信糖 OH H OH OH B-D-Gle B-D-Glc