70570-55-7 L-Valine, 1,1'-((10,12-dimethyl-2-oxo-2H,6H-1,4-oxazino(3,2-b)phenoxazine-5,7-diyl)dicarbonyl)bis(L-threonyl-D-valyl-L-prolyl-N-methylglycyl-N-methyl-, di-xi-lactone