Study of the stability of the biologically active compound N-[2-[4-oxo-3(4H)-quinazolinyl]propionyl]-guanidine using electrophoresis and mass spectrometry. sorpchrom [Internet]. 2024 May 28 [cited 2026 Apr. 3];24(2):257-6. Available from: https://journals.vsu.ru/sorpchrom/article/view/12128