| http://www.w3.org/ns/prov#value | - In another subgroup of compounds, R1 is H and R2 is a phenyl substituted with a heteroaromatic (furyl or pyridyl) group such as, for example, 3,4-dihydroxy-5-[4-(5-methylfur)-2-yl)phenyl]-2(5H)-furanone; 3,4-dihydroxy-5-[4-(5-methylpyrid)-2-yl)phenyl]-2(5H)-furanone; 3,4-dihydroxy-5-[4-(3-methylpyrid)-2-yl)phenyl]-2(5H)-furanone; 3,4-dihydroxy-5-[4-(4-methylpyrid)-2-yl)phenyl]-2(5H)-furanone; 3,4-
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