Refactor the unstructured text into a valid JSON dictionary. The key names follow the Darwin Core Archive Standard. If a key lacks content, then insert an empty string. Fill in the following JSON structure as required: {"catalogNumber": "", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}
   Oleaceae U   I tree, ca. 5 m. tall.    ~m;x FRAXINU        ,Cl IN SMALL, SLOPING CLEARING. SOIL: SANDY.      RYX JARL K. HILTUNEN 1559978 R  s     ( 161-07-07 fraxinus pennsylvanica ?ul    42.4457 c] 
{"catalogNumber": "1559978", "order": "", "family": "Oleaceae", "scientificName": "Fraxinus pennsylvanica", "scientificNameAuthorship": "", "genus": "Fraxinus", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Jarl K. Hiltunen", "recordNumber": "", "verbatimEventDate": "1961-07-07", "habitat": "In small, sloping clearing. Soil: sandy.", "occurrenceRemarks": "Tree, ca. 5 m. tall.", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "42.4457", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}