B-2742

7-[4-(Ethoxycarbonyl)piperazin-1-yl]-4-nitrobenzofurazan 1-oxide

7-Nitro-4-[4-(ethoxycarbonyl)-1-piperazinyl]benzofurazane 3-oxide

7-[4-(Ethoxycarbonyl)piperazin-1-yl]-4-nitrobenzofurazane 1-oxide