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": ""}
 united states   t    BG 1539449  asteraceae 6cp   etk> A. Gray    SENECIO /D   4? HERBARIUM OF PARKE, DAVIS, & COMPANY        C  !< BIGELOVII       1853 r!pj  Asterales ;)  
{"catalogNumber": "1539449", "order": "Asterales", "family": "Asteraceae", "scientificName": "", "scientificNameAuthorship": "A. Gray", "genus": "Senecio", "subgenus": "", "specificEpithet": "bigelovii", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "1853", "habitat": "", "occurrenceRemarks": "Herbarium of Parke, Davis, & Company", "associatedTaxa": "", "country": "United States", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}