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": ""}
  i 1950-04-12  3@S thakur rup chand  (wall.) arn. ex choi2sy s     , Convolvulaceae  *eX) argyreia roxburghii    west garo hills k?     0   1521664      g9t;  PHULBARI   p1W roxburghii   u>? IN THICKET Meghalaya    india Y 
{"catalogNumber": "1521664", "order": "", "family": "Convolvulaceae", "scientificName": "Argyreia roxburghii", "scientificNameAuthorship": "(Wall.) Arn. ex Choisy", "genus": "", "subgenus": "", "specificEpithet": "roxburghii", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Thakur Rup Chand", "recordNumber": "", "verbatimEventDate": "1950-04-12", "habitat": "In thicket", "occurrenceRemarks": "", "associatedTaxa": "", "country": "India", "stateProvince": "Meghalaya", "county": "West Garo Hills", "municipality": "", "locality": "Phulbari", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}