For what product minimum conversion was obtained?
SELECT ?product, ?product_label
WHERE {
  orkgr:R155272 orkgp:compareContribution ?contrib.
  ?contrib orkgp:P43149 ?product;
           orkgp:P43148 ?conversion.
  ?product rdfs:label ?product_label.
  ?conversion rdfs:label ?conversion_label.
}
ORDER BY ASC(xsd:float(?conversion_label))
LIMIT 1