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": ""}
      @P 1937-02-19   MEXICO L?    5209 V$    ESCUL3NTA ~9+ @   fabale 4 `#    z FABACEAE   ^[T# 1168961   l7?C  C. CONZATTI   17.231  f_U   qr&Nn leucaena esculenta
{"catalogNumber": "1168961", "order": "Fabales", "family": "Fabaceae", "scientificName": "Leucaena esculenta", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "esculenta", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "C. Conzatti", "recordNumber": "5209", "verbatimEventDate": "1937-02-19", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "Mexico", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "17.231", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}