in the case of complete oxidation of ascorbic acid to dehydroascorbic acid , c ( 6 ) -oh is reestablished ( indicating the reopening of the furanoid ring ) , while c ( 2 ) -oh as well as the c ( 2 ) = c ( 3 ) double bond have disappeared due to the deprotonation of c ( 2 ) -oh and c ( 3 ) -oh .
C0003968
ascorbic acid
C0011177
dehydroascorbic acid