a modified compound that has at least one further functional group , in particular a bio - or macromolecule , comprising at least one x - fold chemoselectively incorporated phosphoramidate group of general formula , npo , and / or at least one x - fold chemoselectively incorporated phosphonamide group of general formula , npo . r 1 and r 1 ′ is selected from the group containing glycerol , polyglycerol , peg polymers of the general empirical formula c 2n h 4n + 2 o n + 1 with n ≧ 1 , c n - alkyl chains with n ≧ 1 ; functionalized c n - alkyl chains with n ≧ 1 , aryls , heteroaryl , silyl , lipids , fluorophores , saccharides , peptides , crown ethers , or a linker , which links the aforementioned groups . r 1 and r 1 ′ can be identical to or different from one another .