. . . . . . "succinosuccinate esters" . "diethylsuccinoylsuccinate" . "2,5-Dihydroxy-1,4-cyclohexadiene-1,4-dicarboxylic acid" . "Diethyl 2,5-dihydroxycyclohexa-1,4-diene-1,4-dicarboxylate" . "Diethylsuccinoylsuccinate" . . "1,4-Bis(ethoxycarbonyl)-2,5-dihydroxy-1,4-cyclohexadiene" . . . . . . "Diethylsuccinoylsuccinate" . .