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": ""}
    @  44.749632   i brassicale@s 1463955 2      n h jane larue    dS BRASSICACEAE   rsH DENSIFLORUM EXCELSIOR 7WPT. cB p   U1 1972-07-21  I` LEPIDIUM  2  [ MICHIGAN   ug LEPIDIUM DENSIFLORUM   d~ Fz Kalkaska   Vt OpCCASIONAL. 
{"catalogNumber": "1463955", "order": "Brassicales", "family": "Brassicaceae", "scientificName": "Lepidium densiflorum", "scientificNameAuthorship": "", "genus": "Lepidium", "subgenus": "", "specificEpithet": "densiflorum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Jane LaRue", "recordNumber": "", "verbatimEventDate": "1972-07-21", "habitat": "", "occurrenceRemarks": "Occasional.", "associatedTaxa": "", "country": "", "stateProvince": "Michigan", "county": "Kalkaska", "municipality": "", "locality": "Excelsior Twp.", "decimalLatitude": "44.749632", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}