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": ""}
   u nigrum Piperales  M   PIPER j   :E1B S. Kuiper  U  1641831 Michigan  ,  Botanical Garden, U. of Michigan, Ann Arbor oM        p@ 5 1926-06    LmKy Piperaceae    piper ngrum $^N  WASHTENAW Q~ rM   Pz7 United States   
{"catalogNumber": "1641831", "order": "Piperales", "family": "Piperaceae", "scientificName": "Piper nigrum", "scientificNameAuthorship": "", "genus": "Piper", "subgenus": "", "specificEpithet": "nigrum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "S. Kuiper", "recordNumber": "", "verbatimEventDate": "1926-06", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Washtenaw", "municipality": "", "locality": "Botanical Garden, U. of Michigan, Ann Arbor", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}