sporidesmin J

(3R)-9-Chloro-2,3,5aα,6,10b,11-hexahydro-10bα,11β-dihydroxy-7,8-dimethoxy-2,3-dimethyl-3α,11aα-epidithio-11aH-pyrazino[1',2':1,5]pyrrolo[2,3-b]indole-1,4-dione