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": ""}
   _Ay 1999-06-18 United States EX:    l7 16652 brassicaceaeA  MICHIGAN !Y#kV     f (l.) medik.  "PETALS WHITE." &0;~   edward g. voss 9Do&g    capsella 33$R    LOCAL WEED IN GRAVEL 45   Capsella bursa-pastoris J7     Mackinac %vh k 
{"catalogNumber": "", "order": "", "family": "Brassicaceae", "scientificName": "Capsella bursa-pastoris", "scientificNameAuthorship": "(L.) Medik.", "genus": "Capsella", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Edward G. Voss", "recordNumber": "16652", "verbatimEventDate": "1999-06-18", "habitat": "Local weed in gravel", "occurrenceRemarks": "\"Petals white.\"", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Mackinac", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}