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": ""}
populus    POPULUS NIGRA g>c   6 qv 1206441      109         FARS   `2 1976-09-13 CONTACT UM HERBARIUM u- L6     M L.   IRAN  l    SALICACEAE   _v4 NIGRA    7A Malpighiales  naomi miller HZ  
{"catalogNumber": "1206441", "order": "Malpighiales", "family": "Salicaceae", "scientificName": "Populus nigra", "scientificNameAuthorship": "L.", "genus": "Populus", "subgenus": "", "specificEpithet": "nigra", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Naomi Miller", "recordNumber": "109", "verbatimEventDate": "1976-09-13", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "Iran", "stateProvince": "Fars", "county": "", "municipality": "", "locality": "Contact UM Herbarium", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}