In which said hetero-bound carbon atoms are part of a substructure —c—x—c—x—

Official title: in which said hetero-bound carbon atoms are part of a substructure —C(=X)—X—C(=X)—X— in which X is an oxygen or sulphur atom or an imino radical, e.g. imidoylguanidines

C07D241/30 (In which said hetero-bound carbon atoms are part of a substructure —c—x—c—x—) appears on 47 US grants and 66 published applications in this corpus.