One was obtained by hydroxylation of the pyrrolidone ring (1.6% of the dose) and the other one by opening of the pyrrolidone ring (0.9% of the dose).
Üks saadi pürrolidoonrõnga hüdroksüülimisel (1, 6% annusest) ja teine pürrolidoonrõnga avamisel (0, 9% annusest).