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": ""}
1515782 4Q zf      r. excelsior  Melrose (Tweed River) -HKA       united kingdom 8L?    Nf|! SCOTLAND   fraxnus r S^     emma j. cole 5U  grpm 51839 C=  OLEACEAE r`         1903-07-21
{"catalogNumber": "1515782", "order": "", "family": "Oleaceae", "scientificName": "", "scientificNameAuthorship": "", "genus": "Fraxinus", "subgenus": "", "specificEpithet": "excelsior", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Emma J. Cole", "recordNumber": "", "verbatimEventDate": "1903-07-21", "habitat": "", "occurrenceRemarks": "GRPM 51839", "associatedTaxa": "", "country": "United Kingdom", "stateProvince": "Scotland", "county": "", "municipality": "", "locality": "Melrose (Tweed River)", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}