Which vegetables are utilized for betanin extraction?
SELECT ?vegetables, ?vegetables_labels
WHERE {
  orkgr:R75363 orkgp:compareContribution ?contrib.
  ?contrib orkgp:P35147 ?compounds.
  ?compounds rdfs:label ?compounds_labels.
  FILTER(REGEX(?compounds_labels, "etanin"))
  ?contrib orkgp:P35148 ?vegetables.
  ?vegetables rdfs:label ?vegetables_labels.
}