FeSO4 x 5 H2O

kgmicrobe.compound:feso4_x_5_h2o chemically defined MAPPED CHEBI NARROW_MATCH

Ontology mapping

Primary identifier
kgmicrobe.compound:feso4_x_5_h2o
Ontology term
CHEBI:75832 — iron(2+) sulfate (anhydrous)
Ontology label
iron(2+) sulfate (anhydrous)

Nutritional roles

Rejected enrichment labels (11)

Provenance-only candidates: these are not synonyms and do not resolve to this record.

Rejected labelDispositionSourceOccurrences
FeSO4 x 6 H2O REJECTED_LABEL kg_microbe
FeSO4 x 6H2O REJECTED_LABEL kg_microbe
FeSO4 x 7H2O REJECTED_LABEL kg_microbe
FeSO4 x7 H2O REJECTED_LABEL kg_microbe
FeSO4·6H2O REJECTED_LABEL kg_microbe
FeSO4・6H2O REJECTED_LABEL kg_microbe
ferrous sulfate (anhydrous) REJECTED_LABEL kg_microbe
ferrous sulfate anhydrous REJECTED_LABEL kg_microbe
iron(2+) sulfate (anhydrous) REJECTED_LABEL kg_microbe
iron(2+) sulfate REJECTED_LABEL chebi_synonym_review
FeSO .7H O REJECTED_LABEL sssom_other_backfill

Chemical properties

Molecular formula
Fe.O4S.5H2O
Data source
MIM curation (#652)

Evidence (3)

DATABASE_MATCH via CultureMech

Imported from CultureMech pipeline, quality=DIRECT_MATCH

DATABASE_MATCH via MIM curation (#321)

molecular_formula 'Fe.O4S' -> 'Fe.O4S.5H2O'. The recorded value described the anhydrous salt while the label names a hydrate, understating the mass by 18 g/mol per water. Corrected because the label states 5 water(s) of hydration, and the recorded formula was byte-identical to the anhydrous parent CHEBI:75832's ChEBI formula ('Fe.O4S') — the mark of a value inherited from the parent rather than measured for this record. Water appended in ChEBI's own dot-separated notation.

CURATOR_JUDGMENT via MIM curation (#652)

FeSO4 x 5 H2O names a formula-supported hydrate, but no exact external ontology term is verified. CHEBI:75832 (iron(2+) sulfate (anhydrous)) is retained only as the asymmetric anhydrous parent while the supplied hydrate keeps a local kgmicrobe.compound identity.

Occurrence statistics

Total occurrences
4
Distinct media
4

Curation history

TimestampCuratorActionNew statusChanges
2026-03-09T06:54:18.022301+00:00 import_from_culturemech IMPORTED MAPPED Initial import from CultureMech pipeline
2026-04-09T00:32:50.689620+00:00 enrich_mim_cas_rn_batch CAS_RN_ADDED MAPPED Added CAS-RN 7720-78-7 from PubChem (via CHEBI:75832)
2026-04-18T00:00:00+00:00 cbclaw_kg_microbe_sweep LLM ADDED_SYNONYMS MAPPED Added 9 synonyms from kg-microbe P4.4 enrichment: FeSO4 x 6 H2O, FeSO4 x 6H2O, FeSO4 x 7H2O, FeSO4 x7 H2O, FeSO4·6H2O, ... (4 more)
2026-05-01T07:35:33.614084+00:00 auto_classify_ingredient_type AUTO_CLASSIFY_INGREDIENT_TYPE set ingredient_type=SINGLE_INGREDIENT (CHEBI primary)
2026-05-01T08:08:29.592243+00:00 auto_classify_ingredient_type AUTO_BACKFILL_CHEBI_CHEMISTRY molecular_formula=Fe.O4S; inchi=InChI=1S/Fe.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/; smiles=O=S(=O)([O-])[O-].[Fe+2]
2026-05-02T03:12:14.471699+00:00 auto_classify_ingredient_type AUTO_CLASSIFY_INGREDIENT_TYPE set ingredient_type=SINGLE_INGREDIENT (chemical structure populated (molecular_formula))
2026-06-02T07:05:13.389192+00:00 infer_roles_from_name_lists ANNOTATED Added media role: MINERAL (confidence: 0.80)
2026-06-09T05:23:46.764919+00:00 correct_stale_ontology_labels.py CORRECTED ontology_label 'FeSO4 x 5 H2O' -> 'iron(2+) sulfate (anhydrous)': synced to canonical CHEBI label (preferred_term 'FeSO4 x 5 H2O' unchanged).
2026-07-20T00:00:00+00:00 migrate_media_roles_to_facets ANNOTATED Migrated legacy media_roles to role facets (#128): MINERAL -> nutritional_roles.IRON_SOURCE
2026-08-13T00:00:00+00:00 add_water_of_hydration ADDED_WATER_OF_HYDRATION molecular_formula 'Fe.O4S' -> 'Fe.O4S.5H2O' (#321); the label states 5 water(s) of hydration, and the recorded formula was byte-identical to the anhydrous parent CHEBI:75832's ChEBI formula ('Fe.O4S') — the mark of a value inherited from the parent rather than measured for this record. Water appended in ChEBI's own dot-separated notation.
2026-08-27T03:16:39.518865+00:00 refresh_occurrence_statistics CORRECTED occurrence_statistics 2/2 -> 294/294 (media_count/total_occurrences), derived from distinct CultureMech recipe ids in the #337 occurrence table. The prior values came from the importer retired in #453, whose media_count counted a list truncated to 50 examples (#449). [source=ingredient_occurrences.tsv culturemech_rev=15a4da5c08 rows=194137 distinct_recipes=15257]
2026-08-29T04:13:24.026329+00:00 hydrate_family_cas CORRECTED cas_rn 7720-78-7 REMOVED, not replaced: it is the anhydrous FeSO4 CAS, and this record names a hydrate -- a different substance with a different formula weight. ChEBI has no term for this hydration state, so no authoritative value can be substituted and a guess is how wrong CAS numbers spread. The grounding is separately wrong (#321); this corrects only the CAS (#334).
2026-09-02T17:40:44.716277+00:00 claude_sssom_surface_form_backfill ADDED_SYNONYMS Recovered 1 surface form(s) that the published SSSOM `other` carried but no curated record did, so a rebuild would have dropped them from KGX: 'FeSO .7H O'. Tokens already present on the kg-microbe ontology node were left out as redundant (#520).
2026-09-12T00:00:00+00:00 reject_hidden_hydrate_synonym_collapses REJECTED_HIDDEN_HYDRATE_SYNONYMS MAPPED Marked hidden hydrate synonym(s) as REJECTED_LABEL so this record no longer resolves sibling hydrate identities (#251): 'FeSO4 x 6 H2O', 'FeSO4 x 6H2O', 'FeSO4 x 7H2O', 'FeSO4 x7 H2O', 'FeSO4·6H2O', 'FeSO4・6H2O'.
2026-09-12T00:00:00+00:00 fix_hydrate_local_identities LOCALIZED_HYDRATE_IDENTITY MAPPED identifier CHEBI:75832 -> kgmicrobe.compound:feso4_x_5_h2o; mapping_quality EXACT_MATCH -> NARROW_MATCH. Preserved the curated formula Fe.O4S.5H2O, cleared parent-derived chemical_properties {'data_source': 'PubChem (via CHEBI:75832)', 'retrieval_date': '2026-04-09T00:32:50.689620+00:00', 'molecular_formula': 'Fe.O4S.5H2O', 'inchi': 'InChI=1S/Fe.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2', 'smiles': 'O=S(=O)([O-])[O-].[Fe+2]'}, and marked 5 parent-derived synonym(s) as REJECTED_LABEL (#652).
2026-09-12T00:00:00+00:00 fix_hydrate_local_identities REFRESHED_HYDRATE_OCCURRENCES MAPPED occurrence_statistics 294/294 -> 4/4 after moving reviewed hydrate source labels off their anhydrous parent identifiers and onto their exact hydrate identities (#652).