Synonyms: L-Cysteine,N-(mercaptoacetyl)-D-tyrosyl-L-arginylglycyl-L-a-aspartyl-, cyclic (1®5)-sulfide, S-oxide; L-Cysteine,N-(mercaptoacetyl)-D-tyrosyl-L-arginylglycyl-L-a-aspartyl-, cyclic (1®5)-thioether, S-oxide (9CI);1-Thia-4,7,10,13,16-pentaazacyclooctadecane, cyclic peptide deriv.; G 4120