triostin C

N-(2-Quinoxalinylcarbonyl)-cyclo[D-Ser*-L-Ala-N-methyl-L-Cys(1)-N,4-dimethyl-L-aIle-N-(2-quinoxalinylcarbonyl)-D-Ser*-L-Ala-N-methyl-L-Cys(1)-N,4-dimethyl-L-aIle-]