2H-Quinolizine-7-propanoic acid, 4-carboxy-1,3,4,6-tetrahydro-9-hydroxy-6-oxo- 4-Carboxy-1,3,4,6-tetrahydro-9-hydroxy-6-oxo-2H-quinolizine-7-propanoic acid 87896-53-5 A 58365B A-58365B A58365B