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": ""}
  $P 748  7<z 1972-10-28       Hong Kong _  THUNB. @      1704779  f$OP  CENCHRUS PURPU[RASCENS f     Yuen L1ong  +q     purpurascens 5 oe    
{"catalogNumber": "1704779", "order": "", "family": "", "scientificName": "Cenchrus purpurascens", "scientificNameAuthorship": "Thunb.", "genus": "", "subgenus": "", "specificEpithet": "purpurascens", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "748", "verbatimEventDate": "1972-10-28", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "Hong Kong", "stateProvince": "", "county": "Yuen Long", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}