2, {3-Dihydro-1H-cyclopenta[b]quinoxaline-1,3-dicarboxylic} acid diethyl ester 6635-26-3 AIDS-124205 AIDS124205 Diethyl 2,3-dihydro-1H-cyclopenta[b]quinoxaline-1,3-dicarboxylate NSC16963 {1H-Cyclopenta[b]quinoxaline-1,} 3-dicarboxylic acid, 2,3-dihydro-, diethyl ester