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": ""}
    1450 B  g   M@[n 1951-10-06 kalamazoo H     Fi,b BETULA United States f j5-   betulaceae M*;F   Michigan         Ã PURPUSII  :8t      texas twp. 6  WOODED AND SHRUBBY STREAM SWAMP NEAR SPRING-HEAD AT BASE OF SANDHILdL. TD   v6?bx SCHNEID.
{"catalogNumber": "", "order": "", "family": "Betulaceae", "scientificName": "", "scientificNameAuthorship": "Schneid.", "genus": "Betula", "subgenus": "", "specificEpithet": "\u00c3\u0097 purpusii", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "1450", "verbatimEventDate": "1951-10-06", "habitat": "Wooded and shrubby stream swamp near spring-head at base of sandhill.", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Kalamazoo", "municipality": "", "locality": "Texas Twp.", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}