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H<jats:sub>2<\/jats:sub>S and ammonia (NH<jats:sub>3<\/jats:sub>) form hydrogen-bonded molecular mixtures at ambient conditions, but their phase behavior and propensity towards mixing under pressure is not well understood. Here, we show stable phases in the H<jats:sub>2<\/jats:sub>S\u2013NH<jats:sub>3<\/jats:sub>system under extreme pressure conditions to 4 Mbar from first-principles crystal structure prediction methods. We identify four stable compositions, two of which, (H<jats:sub>2<\/jats:sub>S) (NH<jats:sub>3<\/jats:sub>) and (H<jats:sub>2<\/jats:sub>S) (NH<jats:sub>3<\/jats:sub>)<jats:sub>4<\/jats:sub>, are stable in a sequence of structures to the Mbar regime. A re-entrant stabilization of (H<jats:sub>2<\/jats:sub>S) (NH<jats:sub>3<\/jats:sub>)<jats:sub>4<\/jats:sub>above 300\u2009GPa is driven by a marked reversal of sulfur-hydrogen chemistry. Several stable phases exhibit metallic character. Electron\u2013phonon coupling calculations predict superconducting temperatures up to 50\u2009K, in the<jats:italic>Cmma<\/jats:italic>phase of (H<jats:sub>2<\/jats:sub>S) (NH<jats:sub>3<\/jats:sub>) at 150\u2009GPa. The present findings shed light on how sulfur hydride bonding and superconductivity are affected in molecular mixtures. They also suggest a reservoir for hydrogen sulfide in the upper mantle regions of icy planets in a potentially metallic mixture, which could have implications for their magnetic field formation.<\/jats:p>","DOI":"10.1038\/s42004-021-00517-y","type":"journal-article","created":{"date-parts":[[2021,6,4]],"date-time":"2021-06-04T10:04:47Z","timestamp":1622801087000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["First principles study of dense and metallic nitric sulfur hydrides"],"prefix":"10.1038","volume":"4","author":[{"given":"Xiaofeng","family":"Li","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angus","family":"Lowe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lewis","family":"Conway","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9486-1204","authenticated-orcid":false,"given":"Maosheng","family":"Miao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8971-3933","authenticated-orcid":false,"given":"Andreas","family":"Hermann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,6,4]]},"reference":[{"key":"517_CR1","doi-asserted-by":"publisher","DOI":"10.1038\/srep06968","volume":"4","author":"D Duan","year":"2014","unstructured":"Duan, D. et al. 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