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": ""}
    y 503       e7Dg -86.35492  m Big Beaver Lake. Sec. 18 T48N R16W  = 46.5565  MICHIGAN LBf-   Xl FREE-FLOATING AND ROOTED AQUATIC IN CA. 1-2' OF WATER.   3kle POTAMOGETONACEAE      L. b)R_Y     m<Ad alger 
{"catalogNumber": "", "order": "", "family": "Potamogetonaceae", "scientificName": "", "scientificNameAuthorship": "L.", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "503", "verbatimEventDate": "", "habitat": "Free-floating and rooted aquatic in ca. 1-2' of water.", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Michigan", "county": "Alger", "municipality": "", "locality": "Big Beaver Lake. Sec. 18 T48N R16W", "decimalLatitude": "46.5565", "decimalLongitude": "-86.35492", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}