The now-defunct synonym Saccharomyces carlsbergensis was and continues to be used in scientific literature, but is invalid, as the name Saccharomyces pastorianus (Reess 1870) has taxonomic precedence.
Head entity: Saccharomyces carlsbergensis
Tail entity: Saccharomyces pastorianus
Relation (head \u2192 tail): taxon synonym
Inverse relation (tail \u2192 head): taxon synonym of