3,4-Isopropylydene-1,2-5,6-dianhydro-dulcitol 4-19-00-05669 (Beilstein Handbook Reference) 63700-05-0 BRN 0081517 D-Mannitol, 1,2:5,6-dianhydro-3,4-O-(1-methylethylidene)-