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": ""}
"Some leaves with purplish spot in center. Assoc.: Robinia; Centaurea _maculosa; romus inermis; Helianthus sp." R    o Michigan |993-09-13 :g_  maculosa f: h       Y 1469243    : S. . GRAY  Kalamazoo x         CpM:* thomas d. trana Persicaria  u   Persicaria maculosa Z    
{"catalogNumber": "1469243", "order": "", "family": "", "scientificName": "Persicaria maculosa", "scientificNameAuthorship": "S. F. Gray", "genus": "Persicaria", "subgenus": "", "specificEpithet": "maculosa", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Thomas D. Trana", "recordNumber": "", "verbatimEventDate": "1993-09-13", "habitat": "", "occurrenceRemarks": "\"Some leaves with purplish spot in center. Assoc.: Robinia; Centaurea maculosa; Bromus inermis; Helianthus sp.\"", "associatedTaxa": "", "country": "", "stateProvince": "Michigan", "county": "Kalamazoo", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}