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": ""}
1930-04-04 K2 C        1557431 [ S     j  Rd to San Miguel, just beyond km 4, in cut-over wooos on slope  UD+& Casar.       salutaris        m.b.r. caruzo $Lh2%     
{"catalogNumber": "1557431", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "Casar.", "genus": "", "subgenus": "", "specificEpithet": "salutaris", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "M.B.R. Caruzo", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "1930-04-04", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "Rd to San Miguel, just beyond km 4, in cut-over woods on slope", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}