Cu(NO3)2 x 3 H2O

[HISTORICAL — superseded by the #321 re-grade below: this record is a hydrate of CHEBI:78036, not an exact match to it] Imported from CultureMech pipeline, quality=DIRECT_MATCH

identifier CHEBI:78036 -> kgmicrobe.compound:cu_no32_x_3_h2o; mapping_quality EXACT_MATCH -> NARROW_MATCH. The record is a hydrate of CHEBI:78036 ('copper(II) nitrate') and was sharing that term's identifier — the identity collapse MAPPING_SEMANTICS §3 forbids, which made a distinct substance indistinguishable from its anhydrous parent downstream. ChEBI has no term for this hydrate and the record carries no verified CAS, so steps 1 and 2 are unavailable and step 3 applies.

molecular_formula 'Cu.2NO3' -> 'Cu.2NO3.3H2O'. 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 3 water(s) of hydration, and the recorded formula was byte-identical to the anhydrous parent CHEBI:78036's ChEBI formula ('Cu.2NO3') — the mark of a value inherited from the parent rather than measured for this record. Water appended in ChEBI's own dot-separated notation.

mapping_quality NARROW_MATCH -> CLOSE_MATCH, predicate skos:narrowMatch -> skos:closeMatch. narrowMatch asserts this record is *narrower in meaning* than CHEBI:78036 ('copper(II) nitrate') — a subsumption ChEBI itself denies: it files hydrates under CHEBI:35505 'hydrate', never under the anhydrous compound, which is not an ancestor even transitively. A hydrate is a distinct substance containing the anhydrous form, not a specialization of it. closeMatch claims similarity without subsumption. The ontology_id and the record's own identifier are unchanged.