3-Oxo-2',3',6',7',12',13',16',17'-octahydro-1'H,3H,5'H,11'H,15'H-spiro[2-benzofuran-1,9'-pyrido[3,2,1-ij]quinolizino[1',9':6,7,8]chromeno[2,3-f]quinoline]-5-carboxylic acid - 3-oxo-2',3',6',7',12',13',16',17'-octahydro-1'H,3H,5'H,11'H,15'H-spiro[2-benzofuran-1,9'-pyrido[3,2,1-ij]quinolizino[1',9':6,7,8]chromeno[2,3-f]quinoline]-6-carboxylic acid (1:1);Spiro[isobenzofuran-1(3H),9'-[1H,5H,9H,11H,15H]xantheno[2,3,4-ij:5,6,7-i'j']diquinolizine]-5-carboxylic acid, 2',3',6',7',12',13',16',17'-octahydro-3-oxo-, compd. with 2',3',6',7',12',13',16',17'-octahydro-3-oxospiro[isobenzofuran-1(3H),9'-[1H,5H,9H,11H,15H]xantheno[2,3,4-ij:5,6,7-i'j']diquinolizine]-6-carboxylic acid (1:1);5(6)-ROX
20°C