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": ""}
6589 aU   SMALL u    OE austrina 1644277   5-  1931-09-01 m      p1 Opuntia austrina     = VICINITY OF CROOKED LAKE OPUNTIA         Qn,D Polk   Cactaceae Z<    
{"catalogNumber": "1644277", "order": "", "family": "Cactaceae", "scientificName": "Opuntia austrina", "scientificNameAuthorship": "Small", "genus": "Opuntia", "subgenus": "", "specificEpithet": "austrina", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "6589", "verbatimEventDate": "1931-09-01", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "Polk", "municipality": "", "locality": "Vicinity of Crooked Lake", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}