Des-N-tetramethyltriostin a

L-Valine, N-(2-quinoxalinylcarbonyl)-D-seryl-L-alanyl-L-cysteinyl-, bimol. lactone, cyclic disulfide

L-Valine, N-(2-quinoxalinylcarbonyl)-D-seryl-L-alanyl-L-cysteinyl-, bimol. (4-1'),(4'-1)-dilactone, cyclic (3-3')-disulfide