Synonyms: 1H-Pyrimido[1,2-a]quinoline,pyoverdin C 2A deriv.; L-Threonine, N-[[5-[(4-amino-3-hydroxy-1,4-dioxobutyl)amino]-2,3-dihydro-8,9-dihydroxy-1H-pyrimido[1,2-a]quinolin-1-yl]carbonyl]-L-a-aspartyl-N5-hydroxy-N5-(3-hydroxy-1-oxobutyl)-D-ornithyl-D-2,4-diaminobutanoyl-L-threonylglycyl-D-seryl-L-seryl-threo-3-hydroxy-L-a-aspartyl-, [1[S-(R*,R*)],2(R)]-;[1[S-(R*,R*)],2(R)]-N-[[5-[(4-Amino-3-hydroxy-1,4-dioxobutyl)amino]-2,3-dihydro-8,9-dihydroxy-1H-pyrimido[1,2-a]quinolin-1-yl]carbonyl]-L-a-aspartyl-N5-hydroxy-N5-(3-hydroxy-1-oxobutyl)-D-ornithyl-D-2,4-diaminobutanoyl-L-threonylglycyl-D-seryl-L-seryl-threo-3-hydroxy-L-a-aspartyl-L-threonine