L-Tyrosine, L-cysteinyl-L-cysteinyl-L-alpha-glutamyl-L-tyrosyl-L-cysteinyl-L-cysteinyl-L- asparaginyl-L-prolyl-L-alanyl-L-cysteinyl-L-threonylglycyl-L-cysteinyl-, cyclic (1->6), (2->10), (5->13)-tris(disulfide)