has role is conjugate acid of is conjugate base of sulfide(2-) hydrogen sulfide hydrosulfide -1 32.980 33.07394 CAS:15035-72-0 CHEBI:29919 Gmelin:24766 HS HS anion HS(-) InChI=1S/H2S/h1H2/p-1 RWSOTUBLDIXVET-UHFFFAOYSA-M [S-][H] chebi_ontology hydrogen sulfide hydrogen(sulfide)(1-) hydrosulfide sulfanide sulfur hydride Saccharomyces cerevisiae metabolite human metabolite