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": ""}
  1666133 Ur Tb   1904-08-2 h  875 :*B8   Acalypha gracilens Ih    euphorbiaceae /aY   W;b M Mr. Arlington       4T K A. GRAY  !1+ kenneth k. mackenzie     *+L gracilens    
{"catalogNumber": "1666133", "order": "", "family": "Euphorbiaceae", "scientificName": "Acalypha gracilens", "scientificNameAuthorship": "A. Gray", "genus": "", "subgenus": "", "specificEpithet": "gracilens", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Kenneth K. Mackenzie", "recordNumber": "875", "verbatimEventDate": "1904-08-21", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "Mr. Arlington", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}