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": ""}
     x Essex  1/ M. J. Oldham  purpurea >3k  IPOMOEA PURPUREA t[ $Z    h[ (L.) ROTH   ONTARIO  ?   SANDY WASTE GROUND ON DOCK, BEHIND FISH PROCESSING PLANT, SINGLE PLANT F8   &_ o/ 1989-09-23 1460941 k   PI=  m. j. oldham     ` SOLANALES    
{"catalogNumber": "1460941", "order": "Solanales", "family": "", "scientificName": "Ipomoea purpurea", "scientificNameAuthorship": "(L.) Roth", "genus": "", "subgenus": "", "specificEpithet": "purpurea", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "M. J. Oldham", "recordedBy": "M. J. Oldham", "recordNumber": "", "verbatimEventDate": "1989-09-23", "habitat": "sandy waste ground on dock, behind fish processing plant, single plant", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Ontario", "county": "Essex", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}