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": ""}
 a 1543222     Croton flavens .W         ~v)Wv Michael A. Vincent, R. James Hickey, Mirabai M. McCarthy, Tia Ahlquist, Laura L. Klein, Sushma Shrestha, & Li Zheng          -66.86932 ;     15545 & 
{"catalogNumber": "1543222", "order": "", "family": "", "scientificName": "Croton flavens", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Michael A. Vincent, R. James Hickey, Mirabai M. McCarthy, Tia Ahlquist, Laura L. Klein, Sushma Shrestha, & Li Zheng", "recordNumber": "15545", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "-66.86932", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}