CHO CHOH CH,OH OH O OCH HO OH OH OCH OH OH OH OH CH2OH a-甲基-D-(+)葡萄糖苷 开链式 β-甲基D(+)-葡萄糖苷 [aJb20=+113 (很少 [aJb20=+17.5 No observable uV or iR absorption band for a carbonyl group) 将开链式写成环状式( Haworth formula)的过程α-甲基-D-(+)-葡萄糖苷 开链式 β-甲基D-(+)-葡萄糖苷 [α]D20=+1130 [α]D20=+17.50 (No observable UV or IR absorption band for a carbonyl group) 将开链式写成环状式(Haworth formula)的过程: (很少) OH H OCH3 OH OH CH2OH O CH2OH OH OH HO OH CHO OH OCH3 H OH OH CH2OH O 1 23 4 5 6