1-O-acetyl-4-deoxy-2,3-di-O-pivaloyl-α-D-lyxohexopyranosyluronic acid methyl ester

1-O-methyl-2,3-O-isopropylidene-α-D-mannuronic acid methyl ester

(2S,6S)-6-(tert-butyldimethylsilyloxymethyl)-2-isopropoxy-2,5-dihydropyran