99632 ⎘
Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups - ; Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms
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