Synonyms: 1,7,13,19,25,31-Hexaoxa-4,10,16,22,28,34-hexaazacyclohexatriacontane,cyclic peptide deriv.; Cyclo(L-a-hydroxyisovaleryl-D-valyl-D-lactoyl-L-valyl-L-a-hydroxyisovaleryl-D-valyl-D-lactoyl-L-valyl-L-a-hydroxyisovaleryl-D-valyl-D-lactoyl-L-valyl)