... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > selenium molecular entity > diselenide > selenohomocystine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > selenium molecular entity > organoselenium compound > selenoamino acid > selenohomocystine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > chalcogen molecular entity > organochalcogen compound > organoselenium compound > selenoamino acid > selenohomocystine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organochalcogen compound > organoselenium compound > selenoamino acid > selenohomocystine