1,2-O-(1-Methylethylidene)-alpha-D-glucofuranose tributanoate 125161-49-1 BRN 6008582 Tri-O-butanyl-3,5,6 O-isopropylidene-1,2-alpha-D-glucofurannose [French] alpha-D-Glucofuranose, 1,2-O-(1-methylethylidene)-, tributanoate