anhydrohexose deoxyketohexose isolevoglucosenone (1R,5R)-6,8-dioxabicyclo[3.2.1]oct-3-en-2-one 1,6-anhydro-2,3-dideoxy-beta-D-glycero-hex-2-enopyranos-4-ulose 126.032 126.11004 Beilstein:5329737 C6H6O3 CHEBI:32577 InChI=1S/C6H6O3/c7-4-1-2-6-8-3-5(4)9-6/h1-2,5-6H,3H2/t5-,6-/m1/s1 Isolevoglucosenone LCOGJKFAVXDKBI-PHDIDXHHSA-N O=C1C=C[C@@H]2OC[C@H]1O2 chebi_ontology