Patent ID: 11916181
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: nan (nan)
Classification: CPC nan | IPC C  H

Claim 18:
19. The heterocyclic compound of claim 9, wherein:
i) X1 to X3 are each N;
ii) X1 and X2 are each N, and X3 is C(R15);
iii) X1 and X3 are each N, and X2 is C(R15);
iv) X2 and X3 are each N, and X1 is C(R15);
v) X1 is N, and X2 and X3 are each C(R15);
vi) X2 is N, and X1 and X3 are each C(R15); or
vii) X3 is N, and X1 and X2 are each C(R15),
and R15 is hydrogen.