Ring Contains Two N Atoms (9/65b) Patents (Class 987/355)
- N in 1 and 4 positions (9/65B64; 9/65B64E; 9/65B64K; 9/65B4V) (Class 987/357)
- N in 1 and 3 positions (9/65B63; 9/65B63E; 9/65B63G; 9/65B63J; 9/65B63K; 9/65B63K2; 9/65B63K4; 9/65B63M; 9/65B63R; 9/65B63V) (Class 987/358)
- N in 1 and 2 positions (9/65B62; 9/65B62E; 9/65B62J; 9/65B62K; 9/65B62M; 9/65B62V) (Class 987/359)
There are no patents to show for this class.