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": ""}
    r x&_ r1951-04-06     4 Mizoram   fruticosa  xQ       C/ THAKUR RUP CHAND 4477 Ch    l 1524  MACLURA FRUTICOSA U ^ u    hmuntha, lushai hills  m$  INDIA oZJ[`    < MORACEAE
{"catalogNumber": "", "order": "", "family": "Moraceae", "scientificName": "Maclura fruticosa", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "fruticosa", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Thakur Rup Chand", "recordNumber": "4477", "verbatimEventDate": "1951-04-06", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "India", "stateProvince": "Mizoram", "county": "", "municipality": "", "locality": "Hmuntha, Lushai Hills", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "1524", "maximumElevationInMeters": ""}