3-acetamido-2,4,5-tri-O-benzyl-3-deoxy-D-mannose diethyl dithioacetal

3-acetamido-3-deoxy-6-O-triphenylmethyl-D-mannose diethyl dithioacetal

(2R,3S,4R)-N-benzyl-3,4-bis(benzyloxy)-2-hydroxymethylpyrrolidine

(-)-(7S,8R)-7,8-O-isopropylidenedioxy-2-oxo-1-azabicyclo[4.3.0]non-5-ene

(-)-(1S,5R)-3,3-dimethyl-8-(3-carboxy-1-propyl)-7-aza-2,4-dioxabicyclo<3.3.0>oct-7-ene