has part has part has_part has role antinematodal drug racemate closantel chebi_ontology CHEBI:77053 R 31,520 A racemate comprising equimolar amounts of (<i>R</i>)- and (<i>S</i>)-clostanel. An anthelmintic, it is used (as the dihydrate of the sodium salt) in veterinary medicine for the treatment of fluke and nematode infections. 5'-chloro-alpha(4)-(p-chlorophenyl)-alpha(4)-cyano-3,5-diiodo-2',4'-salicyloxylidide R 31520 (R)-closantel (S)-closantel