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)