Features of the steroid profile of saliva in patients with COVID-19 was 
a mild course (n=7), the 2  group was 
a moderate course (n=7), and the 3  group was 
a severe course
 DBU-Catalyzed alkyne-imidate cyclization toward 1-alkoxypyrazino[1,2-a]indole synthesisDBU-Catalyzed alkyne-imidate cyclization toward 1-alkoxypyrazino[1,2-
a]indole synthesis
 Discussion technique: a modification and transformationDiscussion technique: 
a modification and transformation