1,2,5,6-Tetrahydro-1-nitroso-3-pyridinecarboxylic acid 3-Pyridinecarboxylic acid, 1,2,5,6-tetrahydro-1-nitroso- 5-22-01-00325 (Beilstein Handbook Reference) 55557-01-2 BRN 0131724 N-NITROSOGUVACINE