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 AUr   19 E2  texas     Brewsterd     0d M& 1644103 OPUNTIA MACROCENTRA !|C+   P)] S0UTH SLOPE       4p%? ENGELM. LYMAN BENSON V +_x  macrocentra 6      Cr- CHILICOTAL MT, BIG BEND NAT. PARK  / T Margery S. Anthony   1947-04-05 p<g  CARYOPHYLLALES 4z  
{"catalogNumber": "1644103", "order": "Caryophyllales", "family": "", "scientificName": "Opuntia macrocentra", "scientificNameAuthorship": "Engelm.", "genus": "", "subgenus": "", "specificEpithet": "macrocentra", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "Lyman Benson", "recordedBy": "Margery S. Anthony", "recordNumber": "19", "verbatimEventDate": "1947-04-05", "habitat": "South slope", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Texas", "county": "Brewster", "municipality": "", "locality": "Chilicotal Mt, Big Bend Nat. Park", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}