10'-O-Demethylstreptonigrin 10'-O-Desmethylstreptonigrin 105933-56-0 2-Pyridinecarboxylic acid, 5-amino-6-(7-amino-5,8-dihydro-6-methoxy-5,8-dioxo-2-quinolinyl)-4-(2,4-dihydroxy-3-methoxyphenyl)-3-methyl- 5-Amino-6-(7-amino-5,8-dihydro-6-methoxy-5,8-dioxo-2-quinolinyl)-4-(2,4-dihydroxy-3-methoxyphenyl)-3-methyl-2-pyridinecarboxylic acid