gordonan 生成
β-D-GlcAp-(1-4)-D-Glcp 、 4-O-(1'-Carboxyethyl)mannose 、 (2S,3S,4S,5R,6R)-6-{(2R,3S,4R,5R,6S)-6-[(2R,3R,4R,5S)-3-(1-Carboxy-ethoxy)-5,6-dihydroxy-2-hydroxymethyl-tetrahydro-pyran-4-yloxy]-4,5-dihydroxy-2-hydroxymethyl-tetrahydro-pyran-3-yloxy}-3,4,5-trihydroxy-tetrahydro-pyran-2-carboxylic acid