(2R,4R)-1-[(2S)-5-[[Imino(nitroamino)methyl]amino]-2-[[(3-methyl-8-quinolinyl)sulfonyl]amino]-1-oxopentyl]-4-methyl-2-piperidinecarboxylic Acid; [2R-[1(S*),2α,4β]]-1-[5-[[Imino(nitroamino)methyl]amino]-2-[[(3-methyl-8-quinolinyl)sulfonyl]amino]-1-oxopentyl]-4-methyl-2-piperidinecarboxylic Acid