1H,6H-Pyrazino[1,2-a:4,5-a']diindole-1,6,8,13(4H,6aH)- tetrone, 4a,7,7a,11,11,11a,1a,14,14a-octahydro-4,11-dihydroxy-6a, 13a-bis(methylthio)-, (4.alpha.,4a.alpha.,6a.beta.,7a.beta. ,11.alpha.,11a.alpha.,13a.beta.,14a.beta.)-(-)- 99572-22-2 Exserhilone NSC610629